Strahan, J.,
delivered the opinion of the court.
The object of this suit is to recover damages against the defendants for the alleged violation of the conditions of a certain bond executed by the defendants to the plaintiff. It appears from the complaint that on the eleventh [10]*10clay of November, 1886, the defendants, Saunders and Church, contracted with the plaintiff to construct, build, erect and put in for the plaintiff, in accordance with certain specifications, a system of water-works, including a reservoir, which they agreed should be constructed and built pursuant to the said specifications; and should have when built, the capacity of holding 500,000 gallons of water, and be water-tight; and for such system of waterworks, built according to such plan and specifications, the plaintiff was to pay them §25,375 in bonds of the town of Pendleton, which were to be received by the contractors in payment at 6 per cent above par; that said Saunders and Church entered upon the performance of said contract and did build and put in a system of water-works for the plaintiff pursuant to said agreement and substantially in accordance with the specifications therefor in all respects save and except that the said Saunders and Church failed and neglected to dig, build and construct a reservoir for water which should contain and hold 500,000 gallons, and have the capacity for holding so much water, and be water-tight; and did notify this plaintiff and claim that they had completed said system of water-works, pursuant to such contract, and did call upon the plaintiff for the contract price of the same; that plaintiff examined said system of water-works, and particularly their reservoir, and finding the same not built according to said contract, and particularly that the said reservoir was not built pursuant to the specifications therefor, and not watertight, did refuse to accept said system of water-works and to pay the balance of the contract price for the same, and at said time plaintiff had paid Saunders and Church, on said agreement, the sum of $22,200 in bonds of the town of Pendleton, at the agreed price of 6 per cent above par, and there still remained unpaid upon said contract price the sum of $3,115, which plaintiff refused to pay over to Saunders and Church, because of their default in putting in said system of water-works according to contract, and particularly because of their failure to construct [11]*11a reservoir pursuant to said contract, and make the same water-tight as required by the specifications; that Saunders and Church, for the purpose of inducing plaintiff to accept the system of ■ water-works so constructed, and particularly to induce the plaintiff to pay them the balance of the contract price of said system of water-works, entered into a new contract with plaintiff, as follows:
“This agreement, made and entered into by and between C. P. Church and R. Saunders, as partners under the firm name of Saunders & Church, parties of the first part, and the committee on fire and water of the town of Pendleton, composed of W. F. Matlock, E. Reith and S. Rothchild, parties of the second part — witnesseth:
“That the parties of the first part, for and in consideration of the acceptance by the town of Pendleton of the water-works system, constructed for said town by the parties of the first part, in its present condition, and the payment by the town of Pendleton to the said first parties of the sum of the water bonds of the town of Pendleton, in the denominations of one thousand dollars each, and numbered 22, 23, 24, 25, 26, 27, 28, and 29, and of the sum of one hundred and ninety-two and f orty-eight one-hundredths dollars, by warrant drawn on the town treasury, that being the balance of the price agreed upon by the first and second parties as due to said first parties from said second parties upon the full and complete completion of said water-works system, the parties of the first part agree to and with said second parties that within ninety days from the date of the signing of the contract the reservoir of the water-works system of the town of Pendleton shall contain at least 500,000 gallons of water, or as much as can be put in the reservoir by pumping, and that said reservoir, when containing 500,000 gallons of water or as near thereto as possible, shall not lose from evaporation and filtration more than one and one-half inches of water, vertical measure, during each (Twenty-four 'hours, and that if said reservoir, when containing said amount of water, at the expiration of said ninety days, [12]*12shall lose more than one- and one-half inches of water by filtration and evaporation during each twenty-four hours, then that the said first parties shall, at their own cost and expense, within twenty days thereafter, make said reservoir water-tight by walling up the north, east and west walls of the same with hard-burned brick laid in cement mortar, and shall plaster the same with cement and black sharp sand, mixed in the customary proportions for cementing cisterns, on the inside of the walls of said reservoir to a depth of at least three-eighths of an inch.
“That the parties of the first part make, sign, execute and deliver to the town of Pendleton a good and sufficient bond in the penal sum of $4; 000, with two or more sureties, to be approved by the common council, conditioned for the faithful performance of their part of the terms of this agreement.
“That the parties of the second part, for and in consideration of the covenants and agreements of the first parties herein mentioned and by them to be kept and performed, hereby agree to and with said parties, not as individuals, but for and on behalf of the town of Pendleton, to accept for said town, subject to the conditions and covenants mentioned in this agreement, the water-works system constructed for the town of Pendleton by the first parties in the condition the same is now in, and to pay and deliver upon the filing of this contract, duly signed and executed by the parties' thereto, accompanied with the bond of the first parties, heretofore mentioned, with the recorder of the town of Pendleton and the approval of the same by the common council, water bonds of the town of Pendleton, in' denominations of one thousand dollars each, and num bered 22, 23, 24, 25, 26, 27, 28, and 29, also a warrant of said town, drawn on the town treasurer, for the sum of one hundred and ninety-two and forty-eight one-hundredths dollars.
“And it is further understood and agreed, by and between the parties to this agreement, that during the time mentioned in this agreement for the completion of [13]*13said reservoir, that the town of Pendleton will pump water into said reservoir to the full capacity of its pumps (except what water shall be needed for consumption in said town) whenever the first parties may desire to make a test of said reservoir, not exceeding once each week; and that the said first parties shall have the right during said time to bleed the reservoir as often as they may deem it necessary for the repairing of the same; and it is further understood and agreed by and between the parties to this agreement that W. F. Matlock, E. Keith, and S. Rothchild, parties of the second part, in the signing and execution of this agreement, assume no personal responsibility, and are not to be held in any way personally liable thereon, but that they sign and execute the same for and on behalf of the town of Pendleton.
“In witness whereof, the parties have hereunto set their hands and seals this twenty-first day of J une, 1887.
“1. Saunders & Church, [l. s.]
“4. W. F. Matlock. [l. s.]
“2. E. Keith. [l. s.]
“3. S. Rothchild. [l. s.]
“In the presence of:
“John J. Balleray.
“Thos. Fitzgerald.
“As to signatures 1, 2, and 3, 4.”
That the foregoing agreement is the agreement or contract between Saunders and Church and the town of Pendleton mentioned in the bond hereinafter set forth;* that on the seventeenth day of June, 1887, the defendants duly made and executed to the plaintiff their certain bond in the words and figures following, to wit:
“Know all men by these presents: That we, C. P. Church and R. Saunders, Zoeth Houser, Lee Moorhouse, C. B. Wáde, and W. T. Chalk are held and firmly bound unto the town of Pendleton in the just and full sum of four thousand dollars .($4,000), for the payment of which sum to the said town of Pendleton, we, and each of us, do by [14]*14these presents, bind ourselves, our heirs, executors and administrators, jointly and severally, firmly by these presents. Signed with our hands and sealed with our seals this seventeenth day of June, A.D. 1887.
“The condition of the above obligation is such that, whereas, the above bounden C. P. Church and E. Saunders are about to enter into a contract with the town of Pendle-ton, supplementary to the contracts now existing between said C. P. Church and E. Saunders, on one part, and the said town of Pendleton on the other, providing for the construction of the system of water-works in the said town, which contract bears date, or is to bear date, the twenty-first day of June, A.D. 1887, and which contract provides for the doing of certain work on the reservoir belonging to said water system, in case the same shall be necessary to make said reservoir water-tight; now, therefore, if said C. P. Church and E. Saunders shall strictly conform to and perform all their covenants contained in said contract, and abide by and perform all the cove nants and conditions therein contained on their part, then this obligation to be and become void, otherwise to be and remain in full force and virtue. Signed and sealed the day and year above written.
“Charles P. Church. [l.s.]
“E. Saunders. [l.s.]
“Zo. Houser. [l.s.]
‘ ‘Lee Moorhouse. [l. s. ].
“C. B. Wade. [l.s.]
“W. T. Chale. [l.s.]
“ Signed, sealed and delivered in presence of .
“John J. Balleray.
“W. E. Crews.
“G-. W. Pittock.
“P. E. Gerould.”
That said bond was, on the twenty-third of June, 1887, approved by the common council of the town of Pendleton; that at said time there remained due the contractors from [15]*15the town of Pendleton, §3,115, and also §5,567.48 for extra material and labor, and plaintiff thereupon paid the same, as per said agreement herein set forth, and plaintiff has performed all other conditions and promises by it on its part to be performed, pursuant to the agreement set forth; that defendants C. P. Church and B. Saunders have not performed nor observed the conditions of the above-stated agreement nor the promises on their part to be observed and performed, but have made default therein; that said reservoir has never had the capacity to contain 500,000 gallons of water without losing more than one and one-half inches of water, vertical measure, by filtration and evaporation during each consecutive twenty-four hours nor less than eleven inches, vertical measure, during such period; that the defendants E. Saunders and C. P. Church were duly notified and well knew the condition of said reservoir and the fact that the same was not water-tight and would not, at the expiration of the ninety days specified, contain the said amount of water without losing more than one and one-half inches of water, vertical measure, by filtration and evaporation during each consecutive twenty-four hours nor less than twenty four inches; but have failed, neglected and refused to make said reservoir water-tight, and have failed, neglected and refused to wall up the north, east and west walls of said reservoir, and to cement the same or to do any act or thing to make said reservoir water-tight, or to observe or perform the conditions of said contract or bond, and still neglect and refuse so to do; and by reason thereof, the conditions of said bond have become broken, and the obligation has become absolute and plaintiff is damaged in the sum of §2,270; that by reason of the default of the said C. P. Church and E. Saunders in coaetructing said reservoir and in making the same water-tight, as provided in the written agreement of June 21, 1887, above set forth, plaintiff was compelled to run its pumps constantly in order to keep a supply of water in said reservoir and to furnish its cisterns with water, and was compelled to employ for such purpose other and extra [16]*16labor, to wit, an additional engineer, ior the period of one hundred and twelve days, and did actually pay as wages for the same the sum of $281, and plaintiff is specially damaged in said sum of $281; that by reason of the said default of the said C. P. Church and R. Saunders, and by reason of said reservoir failing to hold the water pumped into it, plaintiff was compelled to run its pumps and engine constantly in order to keep a supply of water in said reservoir and to furnish its customers with water, and was compelled to use and burn much larger quantities of wood, to wit, 112 cords, and that said wood was reasonably worth $4.49 per cord, and plaintiff was thereby specially damaged in the sum of $502.88; that by reason of the default of said Saunders and Church, the plaintiff was compelled to run its engine at a higher pressure than it would have run the same and drive its pumps at a greater rate of speed, and frequently it was compelled to shut the water off from the reservoir and to supply its customers with water directly from its pumps, and by reason thereof plaintiff’s engine and pumps were much worn and damaged and plaintiff was thereby damaged in the further sum of $200. Said complaint was duly verified and filed.
To this complaint defendants filed a general demurrer, and the demurrer having been overruled, the defendants answered. By the answer defendants admit the contract made by Saunders and Church with plaintiffs, dated November 11, 1886, and that Saunders and Church proceeded under the same to construct a system of waterworks for plaintiff, and gave notice to plaintiff that they had completed the same. They admit that at the time Saunders and Church gave notice to plaintiff of the completion of said water-works they had been paid the sum of $22,200, and there was still due on the said contract the sum of $3,115, and the further sum of $5,567.48 for extra work and for material. They admit that on the seventeenth day of June the defendants executed the bond set out in plaintiff’s complaint, and that on the execution of said bond the plaintiff paid to Saunders and Church the [17]*17sums then due them. The answer then denies specifically every other allegation of plaintiff’s complaint, including the alleged inducement for signing the contract and bond sued on in this cause and set out in plaintiff’s complaint.
Defendants alleged, in their answer, the following new matter : That at the time said Saunders and Church gave such notice and made such demand (that is, gave notice that they had completed their contract and demanded the balance then due them), they had completed said system of water-works including said reservoir according to the said contract and said plans and specifications therefor ; that plaintiff being unprepared at the time of the completion of said work to make a test thereof, and being unwilling to accept the same without such test, and refusing to pay said Saunders and Church the balance of the contract price for said work, namely, the sum of S3,115, besides the sum of |5,567.48 due said Saunders and Church for extra work and materials, and said Saunders and Church being about to sue the plaintiff for said sums due them, the plaintiff and defendant, to avoid litigation, entered into the contract set up in plaintiff’s complaint; that after the making of the contract mentioned in plaintiff’s complaint, dated November 11,1886, by and between Saunders and Church and the plaintiff herein, the said Saunders and Church did build and construct for plaintiff the said system of water-works in the town of Pendleton, including the reservoir belonging to said system, in strict accordance with the plans and specifications which formed a part of said contract, except where the same were changed by the direction and at the request of plaintiff, and did build and construct said reservoir so that the same had a capacity of and was capable of holding more than 500,000 gallons of water, and was when holding such quantity of water and at all times water-tight, and said Saunders and Church thereupon demanded of plaintiff the balance of the contract price of said system of water-works, which then amounted to §3,115, and the price of extra work done thereon and material furnished therefor, which amounted to the sum of $5,567.48; that [18]*18plaintiff, without any just cause or reason therefor, declined to pay said sums due said Saunders and Church and declined to test and receive said system of water-works till Saunders and Church would enter into and sign the contract of June 21, 1887, and furnish the bond, which is set out in plaintiff’s complaint; that after the signing of said agreement and bond set out in plaintiff’s complaint, the defendants Saunders and Church, during the time therein mentioned and provided for the completion of said reservoir, repeatedly requested plaintiff to pump water into said reservoir to the full capacity of its pumps (except what water was needed for consumption in said town), in order to make tests of said reservoir, but the plaintiff neglected and refused, at all times, to comply with said request; that within ninety days from the signing of said contract of June 21, 1887, the said reservoir was capable of containing and did contain 500,000 gallons of water, and did not lose from evaporation and filtration more than one and one-half inches of water, vertical measure, during each or any twenty-four hours, and was then and has been ever since water-tight; that said Saunders and Church have kept and performed on their part all the provisions and promises contained in said agreement of June 21, 1887, set out in plaintiff’s complaint, which were to be kept and performed on their part, and that none of the conditions of said bond set up in the plaintiff’s complaint and on which this action was brought have been broken.
The reply put in issue the new matter contained in the answer. A trial before a jury resulted in a verdict and judgment for the plaintiff in the sum of $2,250, from which judgment this appeal is taken. The notice of appeal contains twenty-six assignments of error, but those only which were specially insisted upon at the argument here will be noticed.
1. The liability of the defendants in this action must be measured by the contract which Saunders and Church made with the plaintiff dated J une 21, 1887, and the bond made pursuant thereto, signed by all of the defendants, [19]*19dated June 17, 1887. Though bearing different dates, these writings were delivered at the same time, took effect simultaneously, and must be construed together as a part of the same transaction. By the first Saunders and Church covenanted with the plaintiff that upon the full and complete completion of said water-works system the parties of the first part agree to and with said second parties that within ninety days from the date of the signing of the contract the reservoir of the said water-works system of the town of Pendleton shall contain at least 500,000 gallons of water, or as much as can be put in the reservoir by pumping; and that said reservoir, when containing 500,000 gallons of water or as near thereto as possible, shall not lose from evaporation and filtration more than one and one-half inches of water, vertical measure, during each twenty-four hours; and that if said reservoir, when containing said amount of water, at the expiration of said period of ninety days, shall lose more than one and one-half inches of water by filtration and evaporation during each twenty-four hours, then, that the said parties shall at their own cost and expense within twenty days thereafter make said reservoir water-tight by walling up the north, east, and west walls of the same with hard-burned brick, laid in cement mortar, and shall plaster the same with cement and black,'sharp sand, mixed in the customary proportion for cementing cisterns, on the inside walls of said reservoir, to the depth of at least three-eighths of an inch. The bond signed by all the defendants recites the ma,king of this contract, and then continues: “And which contract provides for the doing of certain work on the reservoir belonging to said water system, in case the same shall be necessary to make said reservoir water-tight. Now, therefore, if said C. P. Church and R. Saunders shall strictly conform to and perform all of their covenants contained in said contract, and abide by and perform all the covenants and conditions therein contained on their part, then this obligation to be and become void, otherwise to be and remain in full force and virtue.” The agreement made [20]*20between Saunders and Church with the town of Pendleton also contained the following provision: * * * ‘ ‘ That during the time mentioned in this agreement for the completion of said reservoir the town of Pendleton will pump water into said reservoir to the full capacity of its pumps, except what water shall be needed for consumption in said town, whenever the first parties may desire to make a test of said reservoir, not exceeding once each week, and that said first parties shall have the right during said time to bleed the reservoir, etc.” These provisions of the contracts between the parties necessarily assume that, although the possession of the system of water-works had passed from the contractors to the town of Pendleton, the reservoir was incomplete, and they pro vide for a time within which the contractors might complete it, that is, make it water-tight. A means of making certain tests is also provided, that is, the town of Pendle-ton will pump water into said reservoir to the full capacity of its pumps whenever the first parties may desire to make a test of said reservoir, not exceeding once in each week' but this provision did not impose the duty on the town of Pendleton of doing more than to run its pumps to their full capacity during the time they were usually and reasonably run. It was not required to go to extraordinary or unusual expense for that purpose, or to increase its force of engineers, if the one already employed was capable of running the pumps to their full capacity during the hours he was accustomed to run the same. If the city did all of this it performed the full measure of its duty in this particular and was not in default. If the supply of water failed for any cause without the city’s fault, so that the reservoir could not be filled at the time required by Saun ders and Church, such failure did not put the city in default. Its agreement was to run its pumps, and I have indicated the extent of its duty in that particular; but if the cistern from which the water was drawn was inadequate, or if, on account of the season, there was a scarcity of water, the city would not be responsible therefor. The [21]*21city bad as much interest in these tests as had Sannders and Church. They were designed for the equal benefit of both parties. The undoubted object was to enable them to know by actual experiment when the reservoir was completed by being water-tight. But I do not think the terms of this contract bring the case within the principle laid down in the numerous cases cited by appellant’s counsel on that subject. Those cases state elementary law, and their authority and binding force is fully recognized and admitted, but they are not applicable to the particular facts disclosed by this record. So far as either party to this record has bound himself to perform any act or thing, we hold he must substantially perform his agreement, and that neither is bound beyond the terms of his contract, and this is the substance of all the authorities cited on this subject by appellant’s counsel. Without entering into a more particular specification, these general observations dispose of a number of the assignments of error by the appellants, adversely to them. A more particular specification would tend to too great prolixity, and I deem it unnecessary.
2. But there is one charge given by the court to which an exception was taken, which is not covered by what has been said; which charge is as follows : “If you find that the supply pipe of the reservoir did allow water to escape through its gates, and that such escape was due to the failure of the gates to shut by reason of gravel getting into the pipe, and if you further find that such gravel got into the pipe from the reservoir after the twenty-first day of June, 1887, and before the expiration of ninety days, by reason of its imperfect construction, and in its ordinary use, I instruct you that such loss was within the scope of the undertaking of the contractors, and they are to be held responsible therefor. I charge you that filtration, in the sense used in these instructions, means leakage from the reservoir from any cause owing to its defective construction, and its incapacity by reason thereof to hold water.”
[22]*22Further on in this charge the court remarked on the same subject: “The burden of proof is upon the plaintiff, the town of Pendleton, to show that at the expiration of the ninety days mentioned in the contract, the reservoir lost by evaporation and filtration, and from no other cause, one and one-half inches of water in twenty-four hours.”
Appellants’ counsel contend that the word filtration used in the contract is there used in its ordinary sense, and that these instructions are erroneous because they assume that it was used in a different sense. The ordinary rule undoubtedly is that language used in a contract is to be understood and held to bp used in its ordinary and usual sense and signification; but within that rule this word would have no signification whatever. The meaning ascribed to it by lexicographers is “the act or process of filtering; the mechanical separation of a liquid from the undissolved particles floating in it”; and the process of filtering is defined “to purify or defecate, as liquor, by causing it to pass through a filter, or porous substance that retains feculent matter.” In the sense in which the word is used in the contract it plainly imports a method of losing water from the reservoir. The words are: “Shall not lose from evaporation and filtration more than one and one-half inches,” etc. To claim that the word in this connection can have or was designed to have its ordinary signfication, is an absurdity.
Looking at the subject matter of this contract, its object, the situation and surroundings of the parties, and particularly the connection in which the word occurs therein, we are not prepared to say the court misinterpreted it to the jury. The only question that does not seem clear to us is whether or not it is admissible in such case to employ interpretation at all; but looking at the whole subject matter in the light in which the parties evidently viewed it when they made the contract, we think that we may properly look for the meaning of the words they used in the context and in the surroundings and situation of the [23]*23parties and the subject matter itself. Tbus viewing the matter, we are not satisfied that the court erred in its charge to the jury now under consideration. Section 700 of the Code aids this view of the matter. By that section it is provided: “When the terms of an agreement have been intended in a different sense by the different parties to it, that sense is to prevail against either party in which he supposed the other understood it; and when different constructions of a provision are otherwise equally proper, that is to be taken which is most favorable to the party in whose favor the provision was made.”
3. The defendants took some exceptions to the introduction of evidence, which requires notice. R. A. Haber-sham, who has been a practical civil engineer for thirty years, was called by the plaintiff and testified without objection, in substance; “I was at the reservoir of the town of Pendleton yesterday. I have the elevation of the hill on which it is situated. I found the top of the reservoir wall about one hundred and forty feet above the pumping house. I took it with a barometer. That is a recognized mode of taking elevations. I have had experience in blasting and digging out excavations in the ground and in soil of the same character as that out of which the reservoir was digged. The effect of blasting is to shake up and loosen such ground, and might have a tendency to give rise to fissures and appertures in the surrounding earth. I have made a test to determine as to whether rock of the character as that out of which the reservoir was digged would resist leakage of water. I tested some of the same rock by putting it in water for twenty-four hours. When I took it out some of the pebbles still stuck together, but generally it had fallen apart and showed no evidence of having anything in the nature of cement in it. The matrix in which the pebbles were enveloped is mostly volcanic ash, with very little cohesiveness about it. I have had experience in building walls- to resist water. If the material into which the reservoir is excavated is solid, whether it be earth or hard pan, it would not require any [24]*24brick or stone lining at all. It would be sufficient to plaster it with cement to prevent absorption. If it is necessary to make a wall on account of one weak spot in the excavation, then a wall (provided the backing is put in well and made solid before any masonry is begun), four inches of brick, laid in good cement, and .laid as you describe, would.be sufficient; but this estimate makes no allowance for any unfaithful or bad work. It must be absolutely sound. For a proper backing I should want a stone backing, or else clay rammed in hard. Irregularities in the side I should have filled in with either concrete or good hard clay, well tamped in. ” After further describing the backing necessary to make the wall safe, etc., the plaintiff’s counsel asked the witness the following question: “I would ask you to state what effect freezing would have on the wall you speak of?” This was objected to and the objection overruled and an exception taken, and the witness then answered: “It would be liable to crack the wall.”
The witness further testified under exception: “The hole in which the reservoir is built, not being water-tight, the reservoir would leak down to the bottom of this crack, and if the clay support were to continue alternately freezing and thawing, it would break off in the neighborhood of that soft place. The tendency would be to yield at all parts of the wall within the reach of this breaking up. ” This witness also, under exception, gave his opinion to the jury on several similar points in the controversy.
Frank Duprat, Felix Eoumagoux, and E. Paschal, who were stone-masons, and who constructed the walls in the reservoir for the city, to make the same water-tight, were each asked various questions tending to elicit their opinions as to the kind of walls necessary to be reasonably safe and durable, what would be the effect upon the wall of water running behind it and freezing, etc.; and to each and all of these questions the defendants’ counsel objected, for the reason that the same was irrelevant and immaterial, which objections being severally overruled, exceptions [25]*25were duly taken. A. J. Ford, who was a brick-mason and bad bad experience in building cisterns and walls, also gave bis opinion as to tbe kind of a wall tbat would be water-tight and reasonably durable.
If these were not proper subjects for expert evidence, or if tbe several witnesses offered did not possess tbe requisite knowledge to enable them to give an opinion, tbe evidence offered should have been excluded on tbe ground of its incompetency; but counsel did not make that objection. They relied upon its immateriality and irrelevancy, and insisted on no other objections.
Under tbe plaintiff’s view of this case, this evidence was both relevant and material. It tended to show tbe nature and character of tbe wall tbe plaintiff was required' to construct in order to make tbe reservoir reasonably durable and water-tight. It was material and relevant as tending to show tbe extent of tbe labor and material which were necessary to construct such wall, and which would, to some extent^ aid. tbe jury in determining tbe amount tbe plaintiff was required to expend in its construction. But allowing tbe defendants tbe benefit of tbe other objection, — tbat such evidence was incompetent, — still tbe exceptions could not be sustained.
Section 706 of Hill’s Code provides: “In conformity with tbe preceding provisions, evidence may be given on tbe trial of tbe following facts:
* * * * * » * * a *
“9. Tbe opinion of a witness respecting tbe identity or bandwriting of a person when be has knowledge of tbe person or bandwriting; bis opinion on a question of science, art, or trade, when be is skilled therein.” * *
This statute merely indicates tbe general rule admitting expert testimony, and I think all tbe testimony to which exceptions were taken, on tbe subject indicated, were of that nature. Each of tbe witnesses appeared to be skilled in tbe particular science, art, or trade, to which tbe questions related. “An expert is one instructed by experience, and to become one requires a course of previous habit and [26]*26practice, or of study, so as to be familiar with, the subject.” Nelson v. Sun Mutual Insurance Company, 71 N. Y. 453. ‘An expert must have made the subject upon which he gives his opinion a matter of particular study, practice or observation; and he must have particular, special knowledge on the subject.” Jones v. Tucker, 41 N. H. 546. ‘‘ Knowledge of any kind, gained for and in the course of one’s business as pertaining thereto, is precisely that which entitles one to be considered an expert, so as to render his opinion, founded on such knowledge, admissible in evidence.” Buffum v. Harris, 5 R. I. 250. And 1 Green - leaf’s Ev., section 440, is an authority to the same point. All of the evidence offered on the subjects indicated above was clearly admissible, and a more particular discussion of the subject would be unprofitable and is unnecessary.
Filed June 10, 1890.]
4. A point was made during the argument here, that the writings sued on were without consideration, and the same question was made prominent during the trial in the court below; but I am unable to discover any force in the appellant’s contention on this point. The writings declared on are under seal, and seal always imports a consideration; but that is not all. The mutual covenants and agreements of the parties are a sufficient consideration to support such mutual promises.
The judgment of the lower court is affirmed.