CALDWELL, Circuit Judge
(after stating the facts as above). At the close of the testimony the defendant preferred a request for a peremptory instruction to the jury to return a verdict for the defendant, upon the ground that the testimony was not sufficient to warrant a verdict for the plaintiff. The court refused to give the instruction, and this ruling is the first assignment, and apparently the one chiefly relied on, as some 60 pages in the brief of 78 pages are taken up with its discussion. The testimony as to the facte was voluminous and conflicting, and the opinions of the experts, as •commonly happens, supported the contention of the party calling them. There is no ground for the contention that there was no evidence to support the verdict, at most it could only be claimed that the verdict was against the apparent weight of the evidence; but that gives this court no warrant to meddle with the verdict of the jury. To do so would be an invasion of the province of the jury, and a practical denial of the right of trial by jury. It was the exclusive province of the jury to pass on the credibility of the witnesses, and, after injecting the testimony of those whom they discredited, the great preponderance of the evidence may have been with the plaintiff.
David Allister, an old and expert miner, who had filled the position of fire boss in mines, and was familiar with the gas that accumulates in mines, and the causes of its accumulation, the dangers resulting from it, and the proper means of expelling it, and who was evidently familiar with the facts of the case and the contentions of the respective parties, was asked this question by the plaintiff:
“Talco the character of room that we have spoken ol', — that is, fifty feet hack from the side entry, where a man is to enter and work towards the face of the working place, getting out the coal, and a horseback should fall out, say, 15 foot to 18 feet long diagonally across the room, that would he anywhere from 16 to 18 inches deep and 35 to 18 feet long across the room, left in that condition, and the fire boss came into the room in the morning, say, about 7 o’clock, with a safety lamp, and should discover some gas in that room or horseback, and he should inform [ — ] that [there] were to work there that they might go to work with their lamps down; then whether or not that would be an ordinary safe place to work.” i
To which question counsel fox* the defendant objected “because irrelevant and incompetent, and because the fact whether or not the room was a safe place to work was a question of fact for the jury, and not a matter of opinion for the witness, and because there is no proof upon which to base such hypothetical question, and the hypothetical question does not state the facte, testified to in the ease.” The objection was overruled, and this ruling is assigned for error.
The question seems to be imperfectly reported. We will assume the record contains the substance of it. The question was probably not framed with as much nicety and precision as it might have been, but it is also true that no two lawyers would have framed the question in the same language; and, if the form of such questions is to be subjected to hypercriticism, very few of them will survive the [332]*332test. If every slight defect or slip which a microscopic eye can detect in a question or answer or the charge of the court is to be counted prejudicial error, litigation will become interminable over subtle refinements and quibbles which were not seen or regarded by the judge or jury at the trial, and which had no bearing whatever on the decision of the case on its merits. Such an administration of the law would be intolerable. “But there is nothing/'’ said Judge (now Mr. Justice) Brown, of the supreme court of the United States, “which tends to belittle the authority of the courts or to impair the confidence of the public in the certainty of justice as much as the habit of reversing cases for slight errors in admitting testimony, or trifling slips in the charge. * * * Better by far the practice of the English courts and the federal supreme court, where every in-tendment is made in favor of the action of the lower court, and cases' are rarely reversed except'for errors going to the very merits, — errors which usually obviate the necessity of a second trial.” Report American Bar Association, 1889, p.-. Though these remarks of the learned justice were not uttered from the bench, they expi*ess the rule upon the subject by which appellate courts should be guided, and they have our approval. There was a map of the room in the mine in which the accident occurred and of the adjacent rooms, which was before the witness, and he had heard the testimony tending to support the theories of the respective parties, and it was upon the supposition that the facts were as plaintiff claimed them to be that the witness’ opinion was based. It is, in substance, the same question which the defendant propounded to its expert witness, by which it sought to and did elicit answers the very reverse of the answers given by the plaintiff’s witness.
It was not objected at the trial, and it is not claimed here, that the witness was not qualified to testify as an expert, and it was not claimed in argument or in the brief that the facts of the case were not such as to make expert, or more properly opinion, testimony admissible. Indeed, it is expressly stated in the-brief of the counsel for plaintiff in error.*
“Had counsel put the questions in proper form, and embodied in them- all the material facts testified to by the witnesses, they might have been asked to give their opinion as to the cause of the explosion.”
But the form of the question will stand the test against any of the objections brought against it at the trial, which are all that can be considered by this court. It was objected to (1) “because irrelevant and incompetent,” which is too general and • indefinite to be dignified with the title of an exception (Insurance Co. v. Miller, 19 U. S. App. 588, 8 C. C. A. 612, 614, and 60 Fed. 254; Railway Co. v. Hall, 32 U. S. App. 60, 14 C. C. A. 153, and 66 Fed. 868); (2) “because the fact whether or not the room was a safe place to work was a question of fact for the jury, and not a matter of opinion for a witness;” as we have seen, this objection was properly abandoned on the argument and in the brief, and if it had been insisted on it would have been of no avail (Rog. Exp. Test. § 120; Railway Co. v. Edwards, 49 U. S. App. 52, 24 C. C. A. 300, and 78 Fed. 745; (3) “be[333]*333cause there was no proof upon which to base such hypothetical question,” but there was, as shown by the record, a large volume of proof upon the subject; and (4) "that the hypothetical question does not stale the facts testified to in the case,” but the law does not require that it should. The testimony of a witness who testifies to opinions is founded either on personal knowledge of the facts, or else is based on facts shown by the testimony of others, or on a hypothesis specially framed on certain facts assumed to be proved for the purpose of the inquiry. Where the opinion of the witness is based on facts testified to by others, it is not necessary that he should have heard all the evidence. It is sufficient if it appears he has heal'd all the testimony which is material to the subject of the inquiry. And when the question is framed on the assumption of certain facts, counsel may assume the fads in accordance with his theory of Unan. It is not essential that he should state the facts as they actually exist. Hog. Exp. Test. §§ 24, 27, and cases cited.
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CALDWELL, Circuit Judge
(after stating the facts as above). At the close of the testimony the defendant preferred a request for a peremptory instruction to the jury to return a verdict for the defendant, upon the ground that the testimony was not sufficient to warrant a verdict for the plaintiff. The court refused to give the instruction, and this ruling is the first assignment, and apparently the one chiefly relied on, as some 60 pages in the brief of 78 pages are taken up with its discussion. The testimony as to the facte was voluminous and conflicting, and the opinions of the experts, as •commonly happens, supported the contention of the party calling them. There is no ground for the contention that there was no evidence to support the verdict, at most it could only be claimed that the verdict was against the apparent weight of the evidence; but that gives this court no warrant to meddle with the verdict of the jury. To do so would be an invasion of the province of the jury, and a practical denial of the right of trial by jury. It was the exclusive province of the jury to pass on the credibility of the witnesses, and, after injecting the testimony of those whom they discredited, the great preponderance of the evidence may have been with the plaintiff.
David Allister, an old and expert miner, who had filled the position of fire boss in mines, and was familiar with the gas that accumulates in mines, and the causes of its accumulation, the dangers resulting from it, and the proper means of expelling it, and who was evidently familiar with the facts of the case and the contentions of the respective parties, was asked this question by the plaintiff:
“Talco the character of room that we have spoken ol', — that is, fifty feet hack from the side entry, where a man is to enter and work towards the face of the working place, getting out the coal, and a horseback should fall out, say, 15 foot to 18 feet long diagonally across the room, that would he anywhere from 16 to 18 inches deep and 35 to 18 feet long across the room, left in that condition, and the fire boss came into the room in the morning, say, about 7 o’clock, with a safety lamp, and should discover some gas in that room or horseback, and he should inform [ — ] that [there] were to work there that they might go to work with their lamps down; then whether or not that would be an ordinary safe place to work.” i
To which question counsel fox* the defendant objected “because irrelevant and incompetent, and because the fact whether or not the room was a safe place to work was a question of fact for the jury, and not a matter of opinion for the witness, and because there is no proof upon which to base such hypothetical question, and the hypothetical question does not state the facte, testified to in the ease.” The objection was overruled, and this ruling is assigned for error.
The question seems to be imperfectly reported. We will assume the record contains the substance of it. The question was probably not framed with as much nicety and precision as it might have been, but it is also true that no two lawyers would have framed the question in the same language; and, if the form of such questions is to be subjected to hypercriticism, very few of them will survive the [332]*332test. If every slight defect or slip which a microscopic eye can detect in a question or answer or the charge of the court is to be counted prejudicial error, litigation will become interminable over subtle refinements and quibbles which were not seen or regarded by the judge or jury at the trial, and which had no bearing whatever on the decision of the case on its merits. Such an administration of the law would be intolerable. “But there is nothing/'’ said Judge (now Mr. Justice) Brown, of the supreme court of the United States, “which tends to belittle the authority of the courts or to impair the confidence of the public in the certainty of justice as much as the habit of reversing cases for slight errors in admitting testimony, or trifling slips in the charge. * * * Better by far the practice of the English courts and the federal supreme court, where every in-tendment is made in favor of the action of the lower court, and cases' are rarely reversed except'for errors going to the very merits, — errors which usually obviate the necessity of a second trial.” Report American Bar Association, 1889, p.-. Though these remarks of the learned justice were not uttered from the bench, they expi*ess the rule upon the subject by which appellate courts should be guided, and they have our approval. There was a map of the room in the mine in which the accident occurred and of the adjacent rooms, which was before the witness, and he had heard the testimony tending to support the theories of the respective parties, and it was upon the supposition that the facts were as plaintiff claimed them to be that the witness’ opinion was based. It is, in substance, the same question which the defendant propounded to its expert witness, by which it sought to and did elicit answers the very reverse of the answers given by the plaintiff’s witness.
It was not objected at the trial, and it is not claimed here, that the witness was not qualified to testify as an expert, and it was not claimed in argument or in the brief that the facts of the case were not such as to make expert, or more properly opinion, testimony admissible. Indeed, it is expressly stated in the-brief of the counsel for plaintiff in error.*
“Had counsel put the questions in proper form, and embodied in them- all the material facts testified to by the witnesses, they might have been asked to give their opinion as to the cause of the explosion.”
But the form of the question will stand the test against any of the objections brought against it at the trial, which are all that can be considered by this court. It was objected to (1) “because irrelevant and incompetent,” which is too general and • indefinite to be dignified with the title of an exception (Insurance Co. v. Miller, 19 U. S. App. 588, 8 C. C. A. 612, 614, and 60 Fed. 254; Railway Co. v. Hall, 32 U. S. App. 60, 14 C. C. A. 153, and 66 Fed. 868); (2) “because the fact whether or not the room was a safe place to work was a question of fact for the jury, and not a matter of opinion for a witness;” as we have seen, this objection was properly abandoned on the argument and in the brief, and if it had been insisted on it would have been of no avail (Rog. Exp. Test. § 120; Railway Co. v. Edwards, 49 U. S. App. 52, 24 C. C. A. 300, and 78 Fed. 745; (3) “be[333]*333cause there was no proof upon which to base such hypothetical question,” but there was, as shown by the record, a large volume of proof upon the subject; and (4) "that the hypothetical question does not stale the facts testified to in the case,” but the law does not require that it should. The testimony of a witness who testifies to opinions is founded either on personal knowledge of the facts, or else is based on facts shown by the testimony of others, or on a hypothesis specially framed on certain facts assumed to be proved for the purpose of the inquiry. Where the opinion of the witness is based on facts testified to by others, it is not necessary that he should have heard all the evidence. It is sufficient if it appears he has heal'd all the testimony which is material to the subject of the inquiry. And when the question is framed on the assumption of certain facts, counsel may assume the fads in accordance with his theory of Unan. It is not essential that he should state the facts as they actually exist. Hog. Exp. Test. §§ 24, 27, and cases cited. And it is no objection that an expert is asked a question involving the point to lx1 decided by the jury. Transportation Line v. Hope, 95 U. S. 297; Railroad Co. v. Meyers, 24 U. S. App. 295, 11 C. C. A. 439, 442, and 63 Fed. 793.
The defendant preferred several requests for chargee which were rightly refused, for two reasons: First, the charge in chief was a remarkably clear, logical, and accurate statement of the law of the case, and was comprehensive enough to cover every aspect of the case, under the evidence; and, second, the special requests singled out particular items of the testimony to the exclusion of all other evidence in the case, which the jury were bound to consider in forming (heir verdict. The practice of giving undue prominence to isolated facts in the case by singling them out and making them the subject of special instruction is vicious, and lias been repeatedly condemned by the supreme court. Smith v. Condry, 1 How. 28, 36; Railway Co. v. Ives, 144 U. S. 408, 433, 12 Sup. Ct. 679. It gives undue prominence to the facts thus singled out, and tends to minimize and disparage other facts of equal or greater importance,, and unnecessarily burdens the jury with instructions which tend to confuse and mislead them. Where the charge in chief comprehends all the facts the jury can rightfully consider in making up their verdict, all special requests to charge as to the legal effect of isolated facts ought to be rejected.
It is assigned for error that the court in the course of its charge told the jury:
“It was the duty of the defendant to use all appliances readily attainable, known to science, for the preven!ion of accidents arising from the accumulation of gas or other explosive substances in its mines.”
In the case of Mather v. Rillston, 156 U. S. 391, 15 Sup. Ct. 464, which was’an action to recover damages for personal injuries resulting from the explosion of powder and caps in an iron mine, the court discusses at length the duty of mine owners to their employés, and laid down the following rule:
“Occupations, however important, which cannot be conducted without necessary danger to life, body, or limb, should not be prosecuted at all without all [334]*334reasonable precautions against such dangers afforded by science. The necessary danger attending them should operate as a prohibition to their pursuit without such safeguards. Indeed, we think it may be laid down as a legal principle that in all occupations which are attended with great and unusual danger there must be used all appliances readily attainable, known to science, for the prevention of' accidents, and that the neglect to provide such readily attainable appliances will be regarded as proof of culpable negligence.”
It will be observed that the clause of the court’s charge excepted to is “laid down as a legal principle” by the supreme court. The charge is not that the defendant must use “all appliances attainable,” etc., but all appliances “readily attainable.” This is imposing a very reasonable burden, for “readily,” according to the dictionaries that are accepted authority, means “quickly, speedily, easily [Century Dictionary]; at hand, immediately available, convenient, handy [Standard Dictionary].” In effect, the contention of the plaintiff in error is that the court should have charged the converse, and told the jury that in occupations attended with great and unusual danger there is no obligation resting on the employer to use the appliances known to science for the prevention of accidents, although they are readily and easily attainable and immediately available, convenient, and handy. The law has not yet reached that degree of barbarity. The case of Pacific Co. v. Seley, 152 U. S. 145, 14 Sup. Ct. 530, does not conflict at all with the later case of Mather v. Rillston, supra. The former related to an “unblocked frog” on a railroad track, into which the deceased voluntarily placed his foot twice, after being admonished of the danger. “Unblocked frogs” are open and visible, and the danger connected with them known and avoidable by em-ployés and all others. In the case of coal mines, employés can very often neither see nor detect the danger they are exposed to, and their safety is absolutety dependent on the intelligent and constant use of methods and appliances more or less scientific, over which they have no control. There would seem to be room, therefore, for a well-grounded distinction between an “unblocked frog” on a railroad track and a coal mine. But if there is not, and the opinions in the two cases conflict, the doctrine of Mather v. Rillston, being the later case, must prevail. This court has approved the rule in Mining Co. v. Ingraham, 36 U. S. App. 1, 17 C. C. A. 71, and 70 Fed. 219, and in principle applied it in Railway Co. v. Jarvi, 10 U. S. App. 439, 3 C. C. A. 433, and 53 Fed. 65, and its soundness is no longer open to question. There are other assignments, but such as do not fall within the reasoning of those we have decided are not of any general importance, and have no merit. They have all been carefully examined. The judgment of the circuit court is affirmed.