Eschweiler, J.
It was and is asserted on behalf of the plaintiffs that the three gallons of oil sold by defendant as and for kerosene, improperly and unlawfully contained some quantity of gasoline, which vaporized, mixed with the air in the house, was drawn into the fire in the stove and thereby caused explosions and fire. It is claimed that the sale of such a mixture gave a right of recovery because a violation of sec. 168.06, Stats., which prohibits, under a penalty and liability for damages resulting therefrom, any person from knowingly selling any kerosene oil for illuminating or heating purposes which, by reason of being adulterated, or for any other reason, will emit a combustible vapor under certain temperature provisions, or will burn freely at a temperature less than 125 degrees above zero; and also that there exists a liability under the rules of [78]*78the common law, irrespective of such statute, for negligently selling for heating or illuminating purposes such an adulterated or dangerous oil. Both of such theories were presented by questions in the special verdict and all answered in plaintiffs’ favor.
If this verdict should stand, either theory of liability would support a judgment against defendant. Knecht v. Kenyon, 179 Wis. 523, 192 N. W. 82; Waters-Pierce Oil Co. v. Deselms, 212 U. S. 159, 179, 29 Sup. Ct. 270; Wellington v. Downer Kerosene Oil Co. 104 Mass. 64; Thornhill v. Carpenter-Morton Co. 220 Mass. 593, 108 N. E. 474; McLawson v. Paragon Ref. Co. 198 Mich. 222, 232, 164 N. W. 668; Anderson v. Standard Oil Co. 180 Iowa, 1054, 164 N. W. 169; Peterson v. Standard Oil Co. 55 Oreg. 511, 106 Pac. 337; 25 Corp. Jur. 190; 11 Ruling Case Law, 700, 705.
To support a judgment for plaintiffs in this case there must be disclosed sufficient evidence to warrant a finding that the claimed result was produced by a sufficient amount of gasoline being mingled with the 6,000 gallons of kerosene in the car unloaded on October 2d or becoming mixed with its contents on the passage through the piping system to the kerosene storage tank, or from there into the barrel from the bottom of which were drawn the three gallons on October 7th. That there could have been no appreciable amount in the car before unloading is quite clear from the uncon-tradicted cross-examination of plaintiffs’ witness, Wilson, the state deputy oil ■ inspector, there being no impeachment or qualification of his testimony that he tested its contents and found them of satisfactory grade and as he so certified. There is no suggestion in the record that the test he made was not in the usual and approved manner and sufficient. There is left, then, the possibility of gasoline becoming mingled with the kerosene on its way from the car to the storage tank by reason of gasoline being left in the piping [79]*79system from a prior pumping of gasoline. No direct testimony that, such happened could be expected to be given or was given. The testimony on both sides on the trial below as to the system of piping; the amount, if any, of gasoline that could remain in such pipes after the pumping from a car had ceased; the direction in which any such amount would travel because of the slope or inclination of such pipes either towards the car from which the pumping was done or towards the storage tanks, is very indefinite and unsatisfactory, leaving it almost if not quite a matter of speculation rather than of possible and reasonable determination, that such a mixture there took place.
No testimony was offered by plaintiffs to indicate what quantity of gasoline must necessarily have been present with the kerosene to cause the result claimed in this case, nor any showing made as to the length of time any required quantity of gasoline would have to be exposed to the open air in order for it to produce such amount of vapor and to permeate the house in order to produce the explosions and fire in the different rooms, as it is claimed by the plaintiffs was done.
The evidence on these different points, especially on the scientific questions involved, is far short of that presented on behalf of the plaintiffs in such cases as Musbach v. Wisconsin C. Co. 108 Wis. 57 (see statement of facts, p. 62 et seq.), 84 N. W. 36, particularly the showing there made that a certain proportionate mixture of such fumes will burn but not explode, and the length of time necessary for the dispersion of a sufficient quantity in a given space; McNear v. Mitchell-Lewis M. Co. 151 Wis. 286, with the details given at pp. 289 to 292 (139 N. W. 535) ; Buggs v. Rock County S. Co. 143 Wis. 462, with the facts as to the chemical process involved at p. 465 et seq. (128 N. W. 100) ; Waters-Pierce Oil Co. v. Deselms, 212 U. S. 159, 29 Sup. Ct. 270, where it was shown (p. 168) that 300 gallons of [80]*80gasoline were run by mistake into 6,600 gallons of coal oil and expert testimony given as to the effect of such mixture (p. 171).
Questions such as were here presented are clearly ones which juries and courts cannot properly determine without the aid of the testimony of experts. Estate of Butt, 181 Wis. 141, 146, 193 N. W. 988; Maryland Cas. Co. v. Thomas F. Co. 185 Wis. 98, 105, 201 N. W. 263; Quass v. Milwaukee G. L. Co. 168 Wis. 575, 577, 170 N. W. 942. Nor can any application of the doctrine of res ipsa loquitur shift the burden of proof from plaintiff to defendant in such class of cases. Maryland Cas. Co. v. Thomas F. Co., supra (p. 106); Pinter v. Wenzel, 173 Wis. 84, 86, 180 N. W. 120; Klein v. Beeten, 169 Wis. 385, 389, 172 N. W. 736.
The testimony of Mrs. Delap, the only eye-witness, would, if the accident happened as she says it did, naturally be somewhat confused and indefinite as to the sequence and details of the event. From her testimony, however, on examination before trial and on the trial, many details were left quite uncertain; for instance, whether the stove door blew open or was left open for some time before the explosion; whether the stopper or cork in the top of the kerosene can was out or in when she started to fill the lamp; which of the two explosions of which she speaks, namely, one at the stove and one at the kerosene can, was first or whether they were simultaneous; whether the can was in the kitchen and its contents exposed to the air any appreciable length of time before the explosion, thereby permitting the fumes of gasoline, if any such there were, to spread into the kitchen and other parts of the house. These matters may be important in connection with her testimony to the effect that she had damp cobs on the fire, and, as she expressed it, “it [the fire] kind of came to life and reached the kerosene can and it exploded,” and the further fact, though standing as she claims she was at a point just [81]*81about between the stove door and the kerosene can and with the latter in her hands, she was not burned either on her person or clothing.
Evidently the doctrine of res ipsa loquitur would not have had sufficient support to establish defendant’s liability on the testimony of Mrs. Delap alone, and plaintiffs called as an expert witness said Wilson, the deputy oil inspector.
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Eschweiler, J.
It was and is asserted on behalf of the plaintiffs that the three gallons of oil sold by defendant as and for kerosene, improperly and unlawfully contained some quantity of gasoline, which vaporized, mixed with the air in the house, was drawn into the fire in the stove and thereby caused explosions and fire. It is claimed that the sale of such a mixture gave a right of recovery because a violation of sec. 168.06, Stats., which prohibits, under a penalty and liability for damages resulting therefrom, any person from knowingly selling any kerosene oil for illuminating or heating purposes which, by reason of being adulterated, or for any other reason, will emit a combustible vapor under certain temperature provisions, or will burn freely at a temperature less than 125 degrees above zero; and also that there exists a liability under the rules of [78]*78the common law, irrespective of such statute, for negligently selling for heating or illuminating purposes such an adulterated or dangerous oil. Both of such theories were presented by questions in the special verdict and all answered in plaintiffs’ favor.
If this verdict should stand, either theory of liability would support a judgment against defendant. Knecht v. Kenyon, 179 Wis. 523, 192 N. W. 82; Waters-Pierce Oil Co. v. Deselms, 212 U. S. 159, 179, 29 Sup. Ct. 270; Wellington v. Downer Kerosene Oil Co. 104 Mass. 64; Thornhill v. Carpenter-Morton Co. 220 Mass. 593, 108 N. E. 474; McLawson v. Paragon Ref. Co. 198 Mich. 222, 232, 164 N. W. 668; Anderson v. Standard Oil Co. 180 Iowa, 1054, 164 N. W. 169; Peterson v. Standard Oil Co. 55 Oreg. 511, 106 Pac. 337; 25 Corp. Jur. 190; 11 Ruling Case Law, 700, 705.
To support a judgment for plaintiffs in this case there must be disclosed sufficient evidence to warrant a finding that the claimed result was produced by a sufficient amount of gasoline being mingled with the 6,000 gallons of kerosene in the car unloaded on October 2d or becoming mixed with its contents on the passage through the piping system to the kerosene storage tank, or from there into the barrel from the bottom of which were drawn the three gallons on October 7th. That there could have been no appreciable amount in the car before unloading is quite clear from the uncon-tradicted cross-examination of plaintiffs’ witness, Wilson, the state deputy oil ■ inspector, there being no impeachment or qualification of his testimony that he tested its contents and found them of satisfactory grade and as he so certified. There is no suggestion in the record that the test he made was not in the usual and approved manner and sufficient. There is left, then, the possibility of gasoline becoming mingled with the kerosene on its way from the car to the storage tank by reason of gasoline being left in the piping [79]*79system from a prior pumping of gasoline. No direct testimony that, such happened could be expected to be given or was given. The testimony on both sides on the trial below as to the system of piping; the amount, if any, of gasoline that could remain in such pipes after the pumping from a car had ceased; the direction in which any such amount would travel because of the slope or inclination of such pipes either towards the car from which the pumping was done or towards the storage tanks, is very indefinite and unsatisfactory, leaving it almost if not quite a matter of speculation rather than of possible and reasonable determination, that such a mixture there took place.
No testimony was offered by plaintiffs to indicate what quantity of gasoline must necessarily have been present with the kerosene to cause the result claimed in this case, nor any showing made as to the length of time any required quantity of gasoline would have to be exposed to the open air in order for it to produce such amount of vapor and to permeate the house in order to produce the explosions and fire in the different rooms, as it is claimed by the plaintiffs was done.
The evidence on these different points, especially on the scientific questions involved, is far short of that presented on behalf of the plaintiffs in such cases as Musbach v. Wisconsin C. Co. 108 Wis. 57 (see statement of facts, p. 62 et seq.), 84 N. W. 36, particularly the showing there made that a certain proportionate mixture of such fumes will burn but not explode, and the length of time necessary for the dispersion of a sufficient quantity in a given space; McNear v. Mitchell-Lewis M. Co. 151 Wis. 286, with the details given at pp. 289 to 292 (139 N. W. 535) ; Buggs v. Rock County S. Co. 143 Wis. 462, with the facts as to the chemical process involved at p. 465 et seq. (128 N. W. 100) ; Waters-Pierce Oil Co. v. Deselms, 212 U. S. 159, 29 Sup. Ct. 270, where it was shown (p. 168) that 300 gallons of [80]*80gasoline were run by mistake into 6,600 gallons of coal oil and expert testimony given as to the effect of such mixture (p. 171).
Questions such as were here presented are clearly ones which juries and courts cannot properly determine without the aid of the testimony of experts. Estate of Butt, 181 Wis. 141, 146, 193 N. W. 988; Maryland Cas. Co. v. Thomas F. Co. 185 Wis. 98, 105, 201 N. W. 263; Quass v. Milwaukee G. L. Co. 168 Wis. 575, 577, 170 N. W. 942. Nor can any application of the doctrine of res ipsa loquitur shift the burden of proof from plaintiff to defendant in such class of cases. Maryland Cas. Co. v. Thomas F. Co., supra (p. 106); Pinter v. Wenzel, 173 Wis. 84, 86, 180 N. W. 120; Klein v. Beeten, 169 Wis. 385, 389, 172 N. W. 736.
The testimony of Mrs. Delap, the only eye-witness, would, if the accident happened as she says it did, naturally be somewhat confused and indefinite as to the sequence and details of the event. From her testimony, however, on examination before trial and on the trial, many details were left quite uncertain; for instance, whether the stove door blew open or was left open for some time before the explosion; whether the stopper or cork in the top of the kerosene can was out or in when she started to fill the lamp; which of the two explosions of which she speaks, namely, one at the stove and one at the kerosene can, was first or whether they were simultaneous; whether the can was in the kitchen and its contents exposed to the air any appreciable length of time before the explosion, thereby permitting the fumes of gasoline, if any such there were, to spread into the kitchen and other parts of the house. These matters may be important in connection with her testimony to the effect that she had damp cobs on the fire, and, as she expressed it, “it [the fire] kind of came to life and reached the kerosene can and it exploded,” and the further fact, though standing as she claims she was at a point just [81]*81about between the stove door and the kerosene can and with the latter in her hands, she was not burned either on her person or clothing.
Evidently the doctrine of res ipsa loquitur would not have had sufficient support to establish defendant’s liability on the testimony of Mrs. Delap alone, and plaintiffs called as an expert witness said Wilson, the deputy oil inspector. He very frankly disclaimed expert knowledge gained through experiments either with mixing kerosene and gasoline or with the passing off of vapor or fumes from the latter or from witnessing explosions, but was permitted to qualify as an expert witness by reason of his some sixteen years’ practical experience as inspector. His testimony in substance was that in a mixture of kerosene and gasoline, the gasoline, being the lighter, rises to the top, and when exposed to the air vaporizes much faster than kerosene does; that such gasoline vapor will explode if in contact with a flame; and that such vapor following the currents of air in a room would be drawn in by the draft of a fire and cause an explosion; and that he did not believe that with kerosene of standard quality used in filling the lamp as testified to by Mrs. Delap such explosion would have resulted.
Mrs. Delap had testified on cross-examination that she poured no kerosene onto the fire in the stove that morning and that she had often used kerosene for the purpose of starting fires, but had not done so in this cottage, in which they had lived since the preceding May.
On the cross-examination of Mr. Wilson he was asked: “Q. Now, if kerosene had been placed upon embers of fire, what would happen in a few moments ?” The trial court sustained the objection interposed to such question on the ground that, being a hypothetical question, it was not based on any facts shown in the case; Mrs. Delap having, as above stated, expressly denied pouring kerosene into the stove and there being no offer on defendant’s part to prove by any [82]*82other witness that such had been done. In so overruling the objection, however, the court stated that defendant was entitled to account for the explosion through any circumstances shown in the evidence or that may be reasonably inferred from anything in the evidence. Defendant also offered to prove by an expert witness, head of the department of chemistry of the Oshkosh high school, what would be the result of placing kerosene on a smoldering wood fire in such a stove, and the objection to such testimony was also sustained.
In his ruling refusing to permit the proposed cross-examination of plaintiffs’ expert witness we think prejudicial and reversible error was committed and that the trial court failed to follow the correct rule of evidence. Unquestionably hypothetical questions put on direct examination of an expert witness should be based upon facts in the record, and to permit the inclusion of others is error. 2 Jones, Ev. (3d ed.) §371; 3 Chamberlayne, Ev. §2459; Sullivan v. M., St. P. & S. S. M. R. Co. 167 Wis. 518, 524, 167 N. W. 311; Dreher v. United Commercial Travelers, 173 Wis. 173, 180 N. W. 815; Schnetzky v. Zanto, 174 Wis. 160, 164, 182 N. W. 751. When it comes to cross-examination of such expert witnesses, however, the rule is not so limited and, within the field of the trial court’s reasonable discretion, questions may properly be framed assuming quite a different state of facts than those appearing in the record for the purpose of testing the knowledge and skill of such witness and the weight to be given to his testimony. 2 Jones, Ev. (3d ed.) § 389; 3 Chamberlayne, Ev. § 2479; Brey v Forrestal, 151 Wis. 245, 258, 138 N. W. 645; Stemons v. Turner, 274 Pa. St. 228, 117 Atl. 922, 26 A. L. R. 727; Bathrick v. Detroit Post & Tribune Co. 50 Mich. 629, 643, 16 N. W. 172. That an undue limitation of such right of cross-examination may be prejudicial error is pointed ©ut in Fernhaber v. Cream City C. Co. 176 Wis. 75, 82, 186 N. W. 175.
[83]*83While Mrs. Delap had on cross-examination positively-denied the pouring of kerosene onto the smoldering fire, yet that being as to a material feature in the case the defendant was not bound by such answer. That there was a smoldering fire in the stove and kerosene in the cottage were conceded facts, and that the kerosene might have been poured on the fire was within the reasonable possibilities, when considered in connection with Mrs. Delap’s testimony of former use of kerosene for firing purposes. The expert having testified as to what would be a possible or probable result from the state of facts testified to by Mrs. Delap, it became eminently proper, on cross-examination, to require him to assume a different state of facts, especially where such covered so plainly a possible state of facts, even though contradictory of that testified to by Mrs. Delap, and to have him answer as to whether the same result could not then have been reached as was reached under the facts assumed on his direct examination.
While some cases, such as Ellis v. Republic Oil Co. 133 Iowa, 11, 110 N. W. 20; Waters-Pierce Oil Co. v. Deselms, 212 U. S. 159, 175, 29 Sup. Ct. 270; Peterson v. Standard Oil Co. 55 Oreg. 511, 523, 106 Pac. 337, supra, hold that it is matter of common knowledge that kerosene is used in starting wood fires and that such use is not necessarily negligence on the part of such user, yet as indicated in McLawson v. Paragon Ref. Co. 198 Mich. 222, 228, 164 N. W. 668, supra, the rule may be otherwise when using kerosene to replenish or hurry a fire already started (upon neither of which points, however, do we deem it necessary to express an opinion) ; yet in view of the disclosed situation and as bearing upon the weight to be given to the evidence offered on behalf of the plaintiffs as to how the accident happened, we think the line of inquiry suggested by the proposed question on cross-examination of Mr. Wilson should have been permitted.
Defendant complains of the refusal to permit his expert [84]*84witness to testify as to the results of experiments made by him with kerosene and gasoline to illustrate or support his oral testimony on the general subject of mixing the two and their vaporizing. The objection, however, was properly sustained upon the then record. 3 Jones, Ev. (3d ed.) §§ 403, 410.
By the Court. — Judgment reversed, and cause remanded for a new trial.