delivered the opinion of the court.
Action by the plaintiff, as administrator of Joseph Battista Pinazza, deceased, to recover on a policy of insurance for the death of his intestate, caused by accident. On May 20, 1908, ■one Labek, a miner working underground in a drift in one of the mines of the Boston and- Montana Consolidated Copper and Silver Mining Company (hereafter referred to as the mining ■company), in Silver Bow county, was overcome by gas. Upon discovery of his condition, through the outcry of his companion, Pinazza, with others who were working with him near by, ran to his assistance. Pinazza preceded the rest, and while attempting to drag the injured man out into the other workings where the air was better and he could have relief, he was himself overcome, and thereafter, on the same day, died from the effects of the inhalation. Prior to that time, and for the benefit of the miners and others in its employ, including Pinazza, the mining company had negotiated with the defendant a policy of insurance, under the terms and stipulations of which the latter *181insured these employees against bodily injuries, whether resulting in death or not, “suffered directly through external, violent and accidental means, on account of an accident occurring during the term” of the policy, by reason of the business operations therein stated, and “while on the premises of the company or upon the ways immediately adjacent thereto, provided for the use of «uch employees or the public.” The policy, among other special agreements, contains the following:
“(A). If the death of any employee shall so result within ninety days from such injuries, independently of all other causes, the company will pay to the assured a sum equal to fifty-two weeks’ wages, computed at the rate per week received by such, injured employee at date of accident; but such sum shall not exceed one thousand five hundred dollars.”
‘ ‘ (F). Recovery may be had for the benefit of the same-employee under one of the foregoing clauses only as respects the result of injuries caused by any one accident; and in no event shall the company’s liability for a casualty resulting in injuries to or death of several persons, exceed ten thousand dollars. ® s
“(G). It is further understood and agreed that injuries, fatal or otherwise, resulting from poison or anything else accidentally absorbed or inhaled while actually engaged in operations connected with business.of the assured, are covered by this policy.” It also contains the following general agreements:
“General Agreements.
“1. The assured,-upon the occurrence of a casualty covered hereby shall give immediate written notice thereof, with the fullest information obtainable at the time, to the company’s duly authorized local agent or to its home office in New York City; and shall also give immediate written notice, with full-particulars, of any and all claims which shall be made on account of a casualty covered hereby; and shall at all times render to the company all possible co-operation and assistance.
“2. Affirmative proof of death, of loss of limb or sight, or of duration of disability must be furnished to the company *182within two months from the time of death, loss of limb or sight, or termination of disability. Legal proceedings for recovery hereunder may not be brought within three months from date of filing final proofs at the company’s home office; nor brought at all unless begun within six months from time of death, loss of limb or sight, or termination of disability. # * , *
^ “10. This policy does not cover disappearance, or suicide—• sane or insane; nor injuries of which there is no visible mark upon the body, nor injuries resulting from voluntary overexertion, exposure to unnecessary danger or violation of law,” etc.
There was indorsed upon it the following, as an amendment to paragraph 10 of the General Agreements: “Indorsement: It is understood and agreed that the clause in paragraph 10 of the General Agreements reading ‘nor injuries of which there is no visible mark upon the body,’ is not to apply to death or permanent disability, resulting directly from an accident covered by this policy, provided that affirmative proof is given to the company that said death or permanent disability was the direct, sole result of an accident as aforesaid.”
The policy was taken by the mining company in its own name, but the premium paid for it was obtained by deductions by the mining company from the monthly wages of all the employees for whose benefit it was negotiated. These deductions were made by their consent. At the time of his death, Pinazsa had been receiving wages at the rate of $28 per week. It is alleged in the complaint that the death of Pinazza occurred during the term of the policy; that the mining company, on behalf of deceased, and on or about May 23, 1908, gave to the defendant written notice of the casualty, and furnished to it affirmative proof of the resulting death, with the fullest information concerning it, according to the terms of the contract, using for that purpose a blank form supplied by the defendant, that the mining company and the plaintiff have performed all the conditions of the contract to be by them performed, and that under the agreements and stipulations contained in it, there is due and owing to the plaintiff $1,456, no part of which has been paid, *183though demand has been made. Judgment is demanded for this amount.
The answer of the defendant, after denying generally the material allegations of the complaint, alleges, as affirmative defenses, the following: (a) That the plaintiff failed to comply with clause 1 of the General Agreements; (b) that he likewise failed to comply with clause 2 of these agreements; (c) that the deceased exposed himself to unnecessary danger, thus causing his own death; and (d) that the plaintiff failed to comply with paragraph 10 of the General Agreements, as amended by the clause indorsed upon the policy. There was issue by reply. The plaintiff had verdict and judgment. The defendant has appealed from the judgment and an order denying its motion for a new trial.
Though the policy in terms designates the mining company as the insured, no question is made but that the defendant is directly liable to the plaintiff, if he, or anyone else on behalf of the deceased, furnished the proof required by the terms of the policy. The principal contention is that the evidence is insufficient to justify the verdict, in that it does not show that affirmative proof that the death of Pinazza was the direct, sole result of poisoning by an inhalation of poisonous gas was furnished to the defendant within two months, or at all.
The defendant did not introduce any evidence. Plaintiff’s evidence tends to show the following: On the next day after the death there was delivered to the local agent of the defendant, signed by the foreman of the mining company, a report on the death of Pinazza, giving the name and address of the mining-company, the name, address and occupation of the deceased, together with the weekly rate of wages paid him, the place where the accident occurred, the name of the foreman in charge, the hospital call made, the name of the attending physician, the alleged cause of the death, and the names and addresses of all persons who witnessed the accident. This was made upon a printed blank furnished by the defendant. The cause of the •death is stated as follows: “Battista Pinazza went to 955 to help *184rescue a man who was knocked out by gas, and inhaled gases which caused his death.” There is no evidence as to how or upon what information this report was made up other than the following: Mr. Burns, a clerk of the mining company, testified: “What I have to do with the accident, part of it, is to receive the report of the accident that comes from the different timekeepers at the mines, enter them in this book [record of accidents], and turn them over to whoever is in charge—the superintendent—for his signature. * * * The original is sent to-their [defendant’s] agents here, and the copy that I keep placed on file.” Thomas, one of the local agents of the defendant, stated: “I said I received a report similar to this; I never received any other report than this, in connection with this, to my knowledge or recollection. I believe this was the only report served on me; that is to the best of my recollection.” There is not any evidence tending to show that there was any communication of any kind between the defendant and the mining company, or the plaintiff, after the delivery of the report. From this evidence it is a fair inference that the report was made up by Burns, the clerk, from the statements of the timekeeper, upon one of a supply of blanks kept for that purpose, and that it was signed by the foreman as a part of the routine business of the office. It is conceded that the report was a sufficient notice of the death. The question, therefore, is whether it is sufficient as affirmative proof of the cause of death, required by paragraph 2 of the General Agreements and the indorsement amendatory of paragraph 10.
The giving of the notice and the furnishing of proof are distinct and separate acts. Proof of death, seasonably made, may serve the purpose of both notice and proof, because the formal statement of facts made in the proof ordinarily must include all the information imparted by the notice. But a mere informal notice does not ordinarily supply the place of formal proof. (O’Reilly v. Guardian Mut. L. Ins. Co., 60 N. Y. 169, 19 Am. Rep. 151; May on Insurance, sec. 460; 4 Joyce on Insurance, sec. 3285.) However the two acts may be done, whether con june*185tively or separately, both are conditions precedent, which must be complied with in order to render the .insurer liable, unless there is an express or implied waiver. (4 Joyce on Insurance, sec. 3286.) In the absence of an express stipulation as to the, form and character of the evidence which must be furnished-, it is difficult to determine in a given case whether the provision as to proof has been complied with. The determination of the question, however, does not rest with the insurer alone. Mr. Joyce, speaking on this subject, says: “The provision requires such notice and proof as may appear to a court to be in accordance with the rules of evidence; and, if such notice and proof have been given, then there has been a compliance with the provision. The question, then, as to what is due proof is to be-determined by the court according to the rules of evidence, and not by the insurers.” (Section 3290.) This statement seems, to imply that the evidence furnished must be such as would be-adjudged by a court admissible under the rules applicable in judicial proceedings. To the same effect is the statement of the-rule in Taylor v. Aetna Life Ins. Co., 13 Gray (Mass.), 434, and in O’Reilly v. Guardian Mut. Life Insurance Co., supra. In the latter ease it is said: “The condition can only be performed by furnishing evidence in some form of the truth of the-fact stated in the notice, and upon which the right of action depends. It need not be that full, clear and explicit proof which would be required upon the trial of an issue upon the question,, but it must be such reasonable evidence as the party can command at the time, to give assurance that the event has happened upon which the liability of the insurers depends. * * ” The purpose of the condition is that the insurer may be able intelligently to form some estimate of his rights and liabilities. before he is obliged to pay, and some proof must be exhibited.”' Our statute (Revised Codes, sec. 5628) declares: “When preliminary proof of loss is required by a policy, the insured is not bound to give such proof as would be necessary in a court of justice; but it is sufficient for him to give the best evidence ■ which he has in his power at the time.” .While this provision,, *186when read in connection with the preceding and following sections, would seem to apply to fire insurance policies exclusively, it applies as well to life and accident insurance. (Revised Codes, sec. 5249.)
The rule stated by the foregoing authorities is vague and indefinite, and the provision contained in the statute is not less so; nevertheless the evident purpose of the legislature in enacting it was to dispense with the necessity of the production, in the first instance, of formal depositions or sworn statements of eye-witnesses, and declare evidence in any form sufficient when it is substantial and trustworthy enough to enable the insurer to form an intelligent estimate of his rights and liabilities under his contract, and is the best evidence which the insured has in his power at the time. It makes it entirely clear that any succinct and intelligent statement, giving the information called for by the stipulation in the policy, whether verified or not, or whether by eye-witnesses or not, is sufficient to put the insurer upon inquiry to determine whether he is liable. It recognizes evidence other than that which falls within the range of judicial evidence, as defined in section 7844, Revised Codes, such as the sworn testimony of witnesses, delivered orally or by deposition, or, in some cases, by affidavit or the like. It includes evidence of any degree which would tend to establish a disputed fact; and the court must in each case determine whether, in whatever form it may be furnished, it gives substantially the information stipulated for.
The report set forth in the statement herein was furnished to the defendant on the next day after Pinazza died. The statement contained in it, touching the cause of his death and the attendant circumstances, is brief, and does not enter into particulars, yet it contains the information that he died from inhaling poisonous gas while in the company’s mine. It is not sworn to; but this formality was not required. It purports to be a statement of an eye-witness, and there is no suggestion in the pleadings or the evidence that it is not a true statement. It tends to show that death was caused solely and exclusively by *187the inhalation of poisonous gas, because the statement is: “He inhaled gases which caused his death.” This direct statement, while not sufficient to establish the fact of death and the cause of it in a judicial investigation, because not sworn to, was nevertheless affirmative evidence of the fact, and was sufficient to put the defendant on inquiry to determine its rights in the premises. If it desired evidence more conclusive because entering more into detail, it should have called for it without unreasonable delay. The names and residences of all the witnesses and of the attending physician were stated; thus, the opportunity was afforded to the defendant, if such course was deemed necessary. Having made no objection, it must be deemed to have waived its right to demand more explicit proof. (Eevised Codes, sec. 5630.) "We do not mean to be understood as saying that, if the report had amounted to nothing more than a mere notice of the death, any duty would have rested upon the defendant to demand the affirmative proof required by the policy. Mere silence does not under such circumstances amount to a waiver on the part of the insurer. (O’Reilly v. Guardian Mut. L. Ins. Co., supra.) We do mean to say, however, that when the insured undertakes to incorporate the notice and the proof in the same communication to the insurer, and the proof of the cause of death, with the attending facts, meets all the requirements of the policy, except that it is not as full and explicit as it might be, the silence of the insurer is a waiver of his right to object.
What we have already said is sufficient answer to a further contention by counsel that the required proofs were not furnished to the defendant within two months from the death of Pinazza, as required by paragraph 2 of the General Agreements, and that the action was therefore prematurely brought.
Contention is made that recovery cannot be had because it appears affirmatively that Pinazza voluntarily exposed himself to unnecessary danger, within the meaning of paragraph 10 of the General Agreements. When it became known to deceased and his companions that a fellow-workman was in danger, and they went to Ms rescue, they found Mm lying about five feet
*188from the entrance of the drift. They had hurried up a ladder to reach the place. Pinazza, apparently thinking that he could go in that distance with safety, did so, and, in attempting to drag the injured man out, was overcome, and while the rest of the party were engaged in rescuing the two, he was so far injured that he died. The presence of gas was apparent as soon as the party reached the place. The general rule on this subject is that the law has so high a regard for human life that it will not impute negligence to one who attempts to save it, unless the attempt be made under such circumstances as to constitute it rashness in the estimation of prudent persons. (1 Labatt on Master and Servant, sec. 360; Thompson on Negligence, 2d ed., 5435.) Thus stated, the rule is broad enough to cover, not only an attempt to save life under spontaneous impulse, aroused by sudden and unexpected perception of the peril, and without thought or calculation of the chances of injury or loss of life to him who makes the attempt, but also an attempt which is made after such calculation as the circumstances permit, the rescuer acting upon the conclusion that he can save the life without the loss of his own. In the latter case the exposure is voluntary in a sense, yet, if under the same circumstances a prudent man would obey the impulse to save a life, the exposure ought not to be held to be voluntary, within the meaning of the contract. At any rate, the danger is not, under the circumstances, unnecessary. This rule, we think, is fairly deducible from the adjudicated cases. (Thomas v. Quartermaine, 18 Q. B. D. 685; Pennsylvania Co. v. Roney, 89 Ind. 453, 46 Am. Rep. 173; Fidelity & Casualty Co. v. Sittig, 181 Ill. 111, 54 N. E. 903, 48 L. R. A. 359; Cottrill v. Chicago etc. Ry. Co., 47 Wis. 634, 32 Am. Rep. 796, 3 N. W. 376; Schwartz v. Shull, 45 W. Va. 405, 31 S. E. 914; De Loy v. Travelers’ Ins. Co., 171 Pa. 1, 50 Am. St. Rep. 787, 32 Atl. 1108; Williams v. United States Mut. Acc. Assn., 60 Hun, 580, 14 N. Y. Supp. 728; Tucker v. Mutual Benefit Co., 50 Hun, 50, 4 N. Y. Supp. 505; United States Mut. Acc. Assn. v. Hubbell, 56 Ohio St. 516, 47 N. E. 544, 40 L. R. A. 453; Smith v. Aetna Life Ins. *189Co., 115 Iowa, 217, 91 Am. St. Rep. 153, 88 N. W. 368, 56 L. R. A. 271; Manufacturers’ Acc. Indemnity Co. v. Dorgan, 58 Fed. 945, 7 C. C. A. 581, 22 L. R. A. 620; Schneider v. Provident L. Ins. Co., 24 Wis. 28, 1 Am. Rep. 157; Providence L. & I. Co. v. Martin, 32 Md. 310.)
The rule which applies to this provision of the policy is ■analogous to that which governs the defense of contributory negligence. The engineer who stands at his throttle in the presence of imminent danger of collision or the derailment of his train by an obstruction on the track, in an effort to save his passengers, and is killed or injured, cannot be said, as a matter of law, to be guilty of contributory negligence. He voluntarily ■exposes himself to the peril, but not unnecessarily so. The circumstances demand that he do his duty, and he does so in ■obedience to those higher impulses which must govern the conduct of the average prudent man. He may use his best judgment as to whether he can save his passengers by assuming the risk, and it is for the jury to say whether in doing so he is guilty of contributory negligence. So, also, in other practical affairs of life. Emergencies often arise calling for immediate action. In all such cases, though action may be accompanied by danger, yet while the exposure to it is voluntary, the danger cannot in any sense of the term be said to be unnecessary. On this subject the court in Fidelity & Casualty Co. v. Sittig, supra, said: ‘.‘For one to leap into a turbulent stream, rush into a burning building, or do any other hazardous thing to save human life, would be a voluntary exposure to danger, but not to unnecessary danger. So, too, many emergencies in the lives of men occur where the most urgent necessity requires their presence at some particular place at some particular time, and where to miss a train would involve serious consequences. In such a case a voluntary exposure to danger might not be unnecessary. The presence of a physician or surgeon at some ■critical period in the illness or injury of a human being might be necessary to save life, and it might be necessary for him to expose himself to danger to reach his patient, or in some other *190respect to perform Ms professional duty. The necessity implied in the-provision of the policy does not mean only that which is unavoidable or inevitable, but also any object or purpose which men of moral responsibility and prudence would regard as of such serious importance in the performance of duty as to demand or justify the incurring of risk of danger to accomplish it.” Under the circumstances, the question whether the exposure of himself, by Pinazza, was unnecessary, was for the jury.
Contention is made that the evidence does not show that Pinazza’s death was caused by the inhalation of gas. There is no merit in this contention. The evidence establishes the presence of gas in the drift; that Labek was overcome by it; that Pinazza went in to rescue him, and was apparently overcome just as was Labek; that his companions suffered more or less from it during the process of rescue; and that they were finally compelled to make use of helmets to protect themselves, before they succeeded in accomplishing it. There was no medical testimony introduced as to the specific cause of death, but, taking the evidence as a whole, it is amply sufficient to justify a finding that the cause of it was the inhalation of gas, as alleged.
Fault is found with certain of the instructions. In the preparation of their brief counsel failed to comply with the rule as to the specifications of error in this regard (Rule X, subdivision “b” [37 Mont, xxxii, 103 Pac. x]); we have nevertheless given attention to the criticisms made, and conclude that they are also without substantial merit.
The judgment and order are affirmed.
Affirmed,.
Mr. Justice Smith and Mr. Justice Holloway concur.