On March 26, 1914, while being operated on for the removal of his tonsils, plaintiff’s intestate died. This action was brought, in behalf of the next of kin, against the two doctors who performed the operation and against Parke, Davis & Company, the manufacturer of the ether used, alleging that the death was caused by the negligence of the defendants. The verdict was against all. Parke, Davis & Company made a separate motion for judgment notwithstanding the verdict or a new trial. The appeal is from the order denying the motion.
It is not possible to notice each of the 128 errors assigned in this record without unduly extending the opinion. All have been examined, but only those deemed meriting attention will be discussed or referred to. Before so doing we must call attention to an omission of appellant’s counsel to conform to the usual practice of noting in the assignments of error, and in the brief, the page or folio in the printed record where the error assigned or discussed may be found and examined. Here the assignments of error merely refer to the folios in the printed record where the motion for a new trial is found; and the references in the motion are to the folio or page in the settled case filed in the district court, and not to the folio or page in the settled case as printed. The purpose of the rule, requiring a printed record, is that each member of the court may therein find what did take place relating to the ruling upon which error is assigned. The rule should be observed in such a manner that its purpose may be attained, and especially in a case of the kind now before us where the printed record contains over 1,300 pages and appellant’s brief nearly 400.
Plaintiff’s intestate, Albert E. Moehlenbroek, was a young man, 21 years old, robust and apparently in good health except for diseased tonsils. He received a few simple treatments for the ailment from Doctor Eosenwald, and then, as a cure, an operation was resorted to. Dr. Eosenwald operated and Dr. Andrews administered the anaesthetic, using a brand of ether manufactured by Parke, Davis & Company. While *159the ether was being given, it was noticed that the patient became cyanotic, and it was necessary to stop and revive him to some extent before proceeding. After the tonsils were removed, he lapsed into the same condition several times, and finally, within about three hours from the commencement of the operation, all efforts to revive him failed and he died. Plaintiff claims that the doctors contributed to the fatal result by their negligence in the administration of the ether, and that Parke, Davis & Company also contributed.thereto by its negligence in manufacturing and placing impure and dangerous ether upon the market for anaesthetic purposes. Under the charge thus made, of distinct and differing acts of negligence concurring to bring about Moehlenbrock’s death, the doctors and the company were placed in a peculiar, antagonistic position; for, in addition to other defenses, it was a good defense for the doctors to show that the fatal outcome was due wholly to -impurities in the ether, a defect they could not anticipate; and for the company to show the carelessness of the doctors as the sole cause. That .made the defendants, in a measure, adverse parties to each other. And many assignments of error by Parke, Davis & Company relate to claimed restrictions on its cross-examination of the doctors, and of a too liberal method of cross-examination of the doctors by plaintiff. We think there was such full and fair cross-examination allowed all parties, at one time or another during the lengthy trial, that no reversible error can be pointed out in relation to this phase of the case.
The doctors rested their cage upon plaintiff’s evidence, and the court would not permit Parke, Davis & Company to call them for cross-examination in making its defense. But we see no prejudicial error here, for the doctors had been thoroughly cross-examined by appellant when they were called to the stand by plaintiff, and Parke, Davis & Company had also the privilege to call them as its witnesses.
Complaint is also made of the rulings allowing the defendant doctors to express an opinion as to the cause of death, confirmed, as they admitted it was in part, by after-acquired information concerning an analysis of ether made by Mr. Horivet. We think there was no error here. The doctors observed and'examined the man, to a certain extent, before the operation began; they noted the effects of the ether upon him, and were present frequently at intervals until death came. As professional men, *160they were competent to express an opinion as to the cause of death. The value of that opinion was for the jury, they determining whether the doctors were justified in relying for corroboration, of the opinion expressed, upon the impurities testified to by Mr. Hortvet being present in the ether as administered to Moehlenbrock. We think the position of these expert witnesses on the cause of death is entirely different from that of the experts whose opinion was sought in Briggs v. Minneapolis & St. L. By. Co. 52 Minn. 36, 53 N. W. 1019. Nor is the after-acquired information, of the analysis, which the doctors considered as corroborative of their opinion, here subject to the objection voiced in Miller v. St. Paul City Ry. Co. 62 Minn. 216, 64 N. W. 554, and Johnson v. Quinn, 130 Minn. 134, 153 N. W. 267. The impurities to which the doctors referred were the ones so fully gone into by the testimony of Mr. Hortvet and the experts of this appellant, that there is no chance that they had any other in mind than those identified by Mr. Hortvet. Thompson v. Bankers Mut. Gas. Ins. Co. 128 Minn. 474, 151 N. W. 180, Ann. Cas. 1916A, 277. It may also be noted that the doctors stated that the opinion expressed was not based upon the Hortvet analysis, but that they considered their opinion corroborated by such analysis.
We think no erroneous rulings, prejudicial to appellant, occurred when Doctors Condit and Liedloff occupied the witness stand. There was sufficient evidence from which the jury could find that the ether administered to Dr. Liedloífs patient was out of the same can used upon Moehlenbrock, and that there had been no change in the condition of the ether during the 24 hours that elapsed between the two operations. Having so found, it would be proper, both for the experts and the jury, to consider the similarity in the effects of the ether upon the two patients in determining the cause of death. It is common knowledge that human beings are physically sufficiently near alike so that we may reason that when a drug or substance produces a marked effect on one person it will, to a certain extent, similarly affect another, taking into account age, strength and other conditions present. In fact the healing art is largely predicated upon this similarity of cause and effect in people. ■
Of course, the admissibility and value of the testimony of Mr. Hortvet, the chemist who analyzed a can of ether delivered to him by plaintiff, and of that of Professor Frankfurter and Dr. Condit based upon *161the result of that analysis, depend, in the first place, upon its being the can from which the ether used upon the deceased was taken, in the second place, upon the impurities in the ether being due to appellant’s lack - of due care, and, in the third place, upon the ether when analyzed being in approximately the same condition as when administered in the operation. We are quite clear that the evidence made the question of identity one for the jury. The experts agreed that the impurities found in the analysis may be produced from oxydization of the ether, and that oxydization begins as soon as air gets into the can and continues until the air is exhausted. Whether it was so negligently prepared or sealed as to account for the dangerous impurities, and whether it was so sealed and kept, after its use for both the Moehlenbrock and Liedloff operations, that no consequential air came into the can before the analysis took place was, in our opinion, also for the jury. Nothing of benefit to the legal profession will be. gained by any attempted résumé of the evidence bearing on that point.
The ruling permitting Professor Frankforter to give his opinion as to whether the ether containing the amount of aldehyde of that analyzed was fit for anaesthetic use cannot be complained of by appellant, for, when finally answered, the witness was compelled to base his opinion upon the knowledge gained through experience, to the exclusion of that acquired by consulting authorities.
During the cross-examination of one of plaintiff’s experts by the doctors’ attorney, a few pages of Gwathmey’s textbook, a standard authority on anaesthesia, so referred to and accepted by all the parties to the action during the trial, were admitted over appellant’s objection. The general rule is that scientific works, with some exceptions not here pertinent, are • inadmissible as substantive evidence either on direct or cross-examination. Eespondent attempts to justify the ruling by a well recognized exception referred to in Wittenberg v. Onsgard, 78 Minn. 342, 81 N. W. 14, 47 L. R. A. 14, and thus formulated in City of Bloomington v. Shrock, 110 Ill. 219, 51 Am. Rep. 678, viz.: “When, however, an expert assumes to base his opinion upon the work of a particular author, that work may be read in evidence to contradict him.” This exception does not aid respondent, for the pages were not offered for the *162purpose of contradicting prior statements of the witness. But the mere fact that these pages were erroneously admitted, does not necessarily mean a new trial. Our attention has not been called to anything in the evidence thus admitted at variance with those excerpts from two other works which, by consent, went to the jury, nor has appellant pointed out wherein anything said by Gwathmey in those pages prejudices appellant, or the theory of its defense, or differed at all from the testimony of its own experts.
The refusal to admit evidence of experiments, and of analysis of different cans and brands of ether, shows no abuse of that judicial discretion which is left to the trial court in such matters. The court might well have refused to strike from the record the statement of plaintiff’s expert, that the doctors’ attorney procured his services; but this ruling should not work a reversal in view of the affidavits presented by appellant on its motion for a new trial, for the jury undoubtedly observed what the affiants who attended the trial noted in respect to the relations between plaintiff and the defendant doctors. No other rulings on the exclusion or admission of evidence deserve special mention.
The claim is made that plaintiff failed to prosecute this action in good faith against the doctors, and that an unlawful conspiracy existed between them and plaintiff against appellant. The verdict against the doctors seems to be a complete refutation of the charge, even if such charge could avail as a defense.
The proposition that the negligence of the doctors, found by the jury, is imputed to Moehlenbrock, and defeats a recovery against defendant, although its negligence was a proximate cause of the death, strikes us as unsound and inapplicable. The doctors were not the agents or servants of their patient, so that their negligence could be considered his negligence, to be taken advantage of as a defense by one who, by an independent act of negligence, also proximately contributed to the injury. The cases cited by appellant do not support his contention, and the one where the facts are at all analogous points to a rule of law entirely opposed to that now contended for. Peterson v. Westman, 103 Mo. App. 672, 77 S. W. 1015. The situation of the parties here may be likened to that of a passenger on a train who is injured through the concurrent negligence of the railroad company carrying him and another person *163or common carrier. Flaherty v. Minneapolis & St. L. Ry. Co. 39 Minn. 328, 40 N. W. 160, 1 L.R.A. 680, 12 Am. St. 654. The rule announced in Stafford v. City of Oskaloosa, 57 Iowa, 748, that if the driver with whom the plaintiff therein was riding, by his negligence contributed with the negligence of the defendant to produce the injury, no recovery could be had, also prevailing in Wisconsin (Lightfoot v. Winnebago Traction Co. 123 Wis. 479, 102 N. W. 30), is contrary to the law obtaining in this state. See Carnegie v. Great Northern Ry. Co. 128 Minn. 14, 150 N. W. 164, and the cases there cited. Appellant is not entitled to regard the operation as a joint enterprise on the part of Moehlenbrock and the doctors, so as to escape liability for its own negligence. In the actual conduct of the operation Moehlenbrock could take no conscious part. It was the joint enterprise of the doctors only.
We see nothing in the claim that concurring negligence of the hospital was shown so as to relieve appellant, as a matter of law. The jury could well find that the storing and handling of the ether from its purchase by the hospital to its use in the operation could not have produced the impurities which the evidence justified them in finding present. And, even though there be contributing or concurring negligence on the part of the hospital, it would not absolve appellant if its negligence also concurred as a proximate contributing cause of the death. Johnson v. Northwestern Tel. Exch. Co. 48 Minn. 433, 51 N. W. 225.
The next contention is that there is a fatal variance between plaintiff’s complaint and his proof. We think there is no merit to the first point made in this connection, namely, that while the allegation is that appellant furnished the ether for the open market the proof showed that it was sold to the hospital. The manner in which the ether was put up and labeled clearly indicates that appellant held it out as a fit substance for anaesthetic uses by surgeons. We. also hold that the evidence warranted the jury in finding that the ether when sold was not safe for that purpose, and that this condition was due to appellant’s failure to use due care to assure its purity when sent forth for the intended use, and that the presence of the impurities, thus suffered to remain or form in the ether, contributed to or caused the death. It was not necessary to prove that this dangerous condition was known to appellant. It was its duty to know that the article it placed before the medical profession as fit for *164anaesthetic use did not contain dangerous and unsafe impurities and was so put up that these impurities could not form in the container, when kept according to directions.
Appellant contends that the proof fails to substantiate the concurring negligence alleged in the complaint, and hence plaintiff must fail. He cites authorities to the effect that, when several acts of negligence are alleged as concurring to produce the injury, all must be proven or the verdict must go for defendant. Western Ry. of Ala. v. McPherson, 146 Ala. 427, 40 South. 924; Wormsdorf v. Detroit City Ry. Co. 75 Mich. 472, 42 N. W. 1000, 13 Am. St. 453, and also decisions holding that, by alleging that separate negligent acts of two or more defendants concurred in causing the injury, there can be no recovery if the negligent act charged against any one of the defendants is not proven, of which these are typical, viz.: St. Louis, B. & S. Co. v. Hopkins, 100 Ill. App. 567; Sturzebecker v. Inland T. Co. 211 Pa. St. 156, 60 Atl. 583; Forsell v. Pittsburgh & M. Copper Co. 38 Mont. 403, 100 Pac. 218. The last mentioned case, in an extended opinion, sustains this doctrine, which to many may seem one of refined technicality.
But we need not approve or disprove the law of the cases cited, for there are two all-sufficient reasons against appellant’s availing itself of the benefit of the rule claimed. The verdict is against the doctors as well as against appellant. Hence the jury found concurrent negligence. Again, the allegations of the complaint, after setting out the specific negligence of appellant, charges that such.negligence "contributed to and caused and was one of the contributing causes of his death,” and like allegation is made in respect to the negligence charged against the doctors. Under this pleading, if the proof showed that Moehlenbrock’s death was the proximate result of the negligence charged against one defendant alone, a recovery could be had against that one. The separate paragraph in the complaint alleging that the several acts of negligence of the several defendants concurred to cause the death may be disregarded. So that we think the complaint herein may be held to authorize a recovery even under these decisions relied on by appellant: Richmond v. City of Marseilles, 190 Ill. App. 227, and Pierson v. Lyon & Healy, 243 Ill. 370, 90 N. E. 693. And under our decisions, cited in 2 Dunnell, Minn. Dig. § 7006, there would seem to be no doubt that *165the complaint is so framed that if the evidence shows that appellant’s alleged negligence was a proximate canse contributing to or causing Moehlenbrock’s death a recovery could be had, even though the negligence alleged against the doctors was not proven, or though it should appear that the negligence of other persons than the defendants concurred with that of appellant to bring about the result.
A great many exceptions are taken upon the charge of the court and the refusal to give certain requests. We find nothing here requiring discussion. The court was right in charging that the doctors, having rested their defense upon plaintiff’s evidence, without introducing any of their own, the evidence thereafter received could not be considered by the jury in determining the doctors’ liability to plaintiff, but should be considered upon appellant’s defense only. Of course it was still open for appellant to show that the sole cause of death was the negligence of the doctors.
A great deal is said about the rule against basing an inference on other inferences in arriving at a conclusion. The jury had no occasion to violate the rule upon this record. Without indulging in inferences, and without invoking the doctrine of res ipsa loquitur (which we agree with appellant to be inapplicable in this case), there is, as already hereinbefore stated, evidence, direct and circumstantial, warranting the jury in finding that there were dangerous impurities in the ether administered to Moehlenbrock; that these existed because appellant had failed to use due care; that these impurities proximately contributed to cause the patient’s death, and that such findings are based upon other facts established by like evidence, such as that the ether analyzed by Hortvet was part of the same can used in the Moehlenbrock operation and the one conducted by Liedloff the next day, and that there was no material change in the condition of the ether, caused by the way it was stored, handled or used, from the time it was sold by appellant until analyzed by Hortvet.
The damages are said to be excessive. The court below was not asked to review the action of the jury because of “excessive * * * damages appearing to have been given under the influence of passion or prejudice.” We feel that this ground for a new trial-was not properly made to the trial court, and no proper assignment of error brings the matter before *166this court. Unless the question of excessive damages has been brought before the trial court on the ground prescribed in subdivision 5 of section 7828, G. S. 1913, it cannot bo raised here.
The order is affirmed.