This is an action under the workmen’s compensation statutes wherein Estella C. Mook, plaintiff and appellee, seeks to recover workmen’s compensation'on account of the death of her husband, Albert L. Mook, from the city of Lincoln, his employer, and the Travelers Insurance Company; the ■compensation carrier for the city of Lincoln, defendants and appellants. Plaintiff claims that her husband died as the result of an accident sustained February 18, 1941, while he was engaged in the performance of his duties as a city fireman.
The action was first tried to one judge of the compensation court where an award as to compensation in accordance with the claim was rendered in favor of the plaintiff.
On the last day for appeal the defendants filed a waiver ■of rehearing before the full compensation court and sought to take an appeal to the district court. On the same day, hut after waiver of rehearing before the full compensation court by the defendants, the plaintiff filed an application for rehearing and modification of the award, claiming that the award was erroneous in that there was a failure to award medical expenses, a statutory attorney’s fee and proper costs. Over objection of the defendants rehearing was had to the full compensation court. On rehearing the full court rendered an award sustaining the previous award and making proper allowances for medical expense, attorney’s fees and costs.
From the award of the full compensation court an appeal was taken to the district court where the award of the compensation court was sustained. From the award of the district court the case comes here on appeal.
Two important questions are presented for determination by this appeal. The first is the propriety, under the •circumstances, of allowing the rehearing before the full compensation court following the waiver of rehearing by the *256defendants who were ostensibly the losers at the hearing before the one judge, and the second is that of whether or not Albert L. Mook came to his death accidentally within the meaning of the workmen’s compensation statutes. We will deal with these questions in the order set forth.
On the question of rehearing, the statutes in section 48-174, Comp. St. Supp. 1941, provide as follows: “(5) Either party at interest who refuses to accept the findings, order, award or judgment of the said judge may, within fourteen days after the date thereof, file with the said court an application for a rehearing, plainly stating the errors on which such party relies for reversal or modification.”
This language is clear and specific. The application of the plaintiff strictly conformed with the plain provisions of this statute and there is no way that this court could deny that right except by judicial legislation. This we are unwilling to do.
This court held in City of Lincoln v. Nebraska Workmen’s Compensation Court, 133 Neb. 225, 274 N. W. 576, in an interpretation of this provision as follows: “The right of either party to a ‘compensation proceeding’ to refuse to accept the findings, order, award or judgment of the judge of the Nebraska workmen’s compensation court who is assigned to hear the same, and to secure, in the manner provided by law, a rehearing or retrial thereof by such compensation court and a determination by a majority of the members thereof, is paramount to, and exclusive of, the right of appeal from such original decision.”
It is the acceptance of the award, or perhaps more aptly stated, it is the failure to make application for rehearing in the manner provided by statute that defeats the right to a rehearing. Shamp v. Landy Clark Co., 134 Neb. 73, 277 N. W. 802.
As to the second question, there is no doubt that Albert L. Mook fell while he was engaged in the performance of his duties as a city fireman. There is no doubt that he died at least within the space of a few minutes, if not instantly. The question for determination is whether he died as a result of the fall or fell as the result of his death.
*257Albert L. Mook, a city fireman, on the evening of February 18, 1941, shortly after seven o’clock p. m. responded with other firemen to a fire call at 2401 Lynn street, Lincoln, Nebraska. The temperature was perhaps about 15 degrees above zero or lower. The house faced to the north and on the south end was a room the roof of which was four or five feet lower than that of the other part. In the east side of the main roof was a dormer. The fire appears to ■ have been in the vicinity of the dormer. The fire, at the time of the fall of Mook, appears to have been under control. At the time of the fall there, was a ladder extending from the ground against and above the roof of the lower room and another against and above the main roof somewhat to the south of the dormer. A third ladder was hooked - over the ridge and was lying flat on the higher roof and, also to the south of the dormer. Mook and another fireman were on the east side of the higher roof and in the vicinity of the two ladders at the time of the fall and a third was' inside the dormer. From the evidence 'it is not clear what position Mook was in when his fall began. It was variously testified that he was on the roof with his toes between the boards from which shingles had been removed; that he had been lying on the ladder which was flat on the roof; that he was standing on the ladder that extended up from the ground and that he was leaning forward toward the roof; that one foot was on the standing ladder and the other on the roof. Some of the evidence would indicate his fall started when he was in an upright position and some that he was not. The manner of the fall is clothed in the same degree of uncertainty. Some of the evidence would indicate that his foot or feet slipped on the roof and that he reached for the ladder or the roof and plunged from the higher to the lower roof where the fall was arrested by the ladder to the lower roof and a hose which was on that roof; some that he slipped on the ladder and from there the plunge took place; and some that from his position on the roof, with arms extended as in a dive, the plunge was taken to the lower roof. Some of the witnesses testified that the top of *258the ladder slipped to the south but not far enough to fall onto the lower roof. The fireman who was on the roof with Mook denied this and stated that he descended the ladder immediately after the fall and that it was then in its original upright position.
Mook made no sound and uttered no word as the plunge was taken except “Oh, gee!” The fireman who was on the roof heard these words, turned and saw the completion but not the start of the plunge. Immediately before Mook had been removing charred shingles from the roof in the vicinity of the dormer.
As soon as possible after the fall he was removed from the roof and into the house where he was placed with the front of his body downward on a davenport with his head turned to the side and attempts at artificial respiration applied. Some minutes later the fire chief arrived on the scene and according to his testimony felt a pulse. On cross-examination he testified that on a former trial he testified thát he thought he could feel a flutter in the pulse. He further said that Mook was gasping at intervals of perhaps three seconds. On the former trial he testified that the gasps came at intervals of from a minute and a half to two minutes. Shortly thereafter Mook was pronounced dead by two doctors who had come to the scene. The fire chief observed a skinned place on the left side of the face around the cheek and left temple.
On the second day after the death an autopsy was performed on the body by Dr. George W. Covey who was assisted by Dr. Helmut Zinneman. Other doctors were present during all or a part of the autopsy but no further mention of this fact is required since these other doctors did not give testimony in the case.
The findings of Dr. Covey, to the extent that it is necessary to set them forth here, were the following: There was no external evidence of skull or other bony injury. There appeared to be a slight bruise on the face which was covered by embalmer’s makeup. The pleural cavity was free from adhesions and it contained no excess fluid. The peri*259cardial cavity was free from adhesions and contained no excess fluid. The heart was heavier than normal and slightly increased in size with the left ventricle preponderating. There were some yellow atheromatous plaques on the inner auricular wall under the epicardium, in the left auricle and above the mitral valve. The anterior leaflet of the mitral valve shows sclerotic thickening. The cavity of the left ventricle was slightly increased in size. Fairly large patches of fibrosis were found in the posterior wall in the left ventricle near the apex which fibrosis involved chiefly the inner half of the myocardium next to the ventricular cavity and extended to the left margin of the heart and more than half way upward to the base of the ventricle. The anterior descending branch was extensively involved by atherosis and in a number of places the lumen was reduced to a narrow slit but there was no apparent complete occlusion. On the posterior portion of the heart the circumflex branch showed marked atheroma. and one of the main branches along the posterior wall of the left ventricle supplying the fibrosed area was completely occluded for some distance. The main branch of the right coronary was competely occluded for a distance of about two cm. by an old thrombus or by atheroma. The abdominal aorta was the seat of extensive atheromatous changes, calcification and so-called ulceration. The thoracic portion was slightly affected by sclerotic changes. The examination disclosed no signs or evidences of traumatic injury notwithstanding a microscopic check was made of the tissues and organs examined, which showed an old coronary thrombosis with myocardial scar tissue, which thrombus had been recanalized and calcium deposits were encountered in the organized thrombus.
Based upon his findings and a hypothesis embracing the age of Mook, which was 52 years, his previous activities which included regular employment on the fire department, assistance with heavy work on a farm, frequent wrestling with other firemen, evidence that he had always been in apparent good health, that he had a year or two earlier passed an examination for life insurance, the fact that a part *260of the rim of a helmet, to the back and right thereof, was broken off, and all of the evidence relating to the fall and the immediately succeeding events, Dr. Covey gave as his opinion that the cause of death was myocardial failure as the result of extensive coronary sclerosis and occlusion with old myocardial fibrosis.
Dr. Helmut Zinneman gaye an opinion as to the cause of death. His opinion was the same as that given by Dr. Covey.
On the other hand Dr. Arthur L. Smith, on a like hypothesis with the findings of Dr. Covey before him, gave it as his opinion that death was caused by brain concussion which concussion came about as a result of the fall. He concluded from the hypothesis that the fall and death were not coincidental but death succeeded the fall by a space of several minutes. His opinion depended in a large measure upon the téstimony of the fire chief that there was a pulsé after the fall and that there was gasping. It is apparent that in the rendition of his opinion he accepted as established that there was a pulse when the fire chief made his examination. It is likewise apparent that his opinion took into account an entire lack of physical or objective finding of trauma in the autopsy except the bruise on the face and the abrasion on the forehead.
It was his opinion that if death had been the result of myocardial failure the fall as described by the witnesses could not have taken place and there could have been no pulse after the failure.
It may be stated here with regard to the fall that the evidence as to the manner thereof is unsatisfactory and uncertain. No two witnesses describe it in the same way and not even a single witness is certain as to all of the aspects of the fall as described by him or her. This is not particularly surprising since the fire was at night and what was seen by all witnesses except the fireman who was on the roof was seen from the ground or from the interior of a house some 20 feet away by the lights from the adjacent house and from an automobile somewhere generally between the two *261houses and perhaps aided to some extent at times by a flashlight. One thing however does appear to be certain and that is that Mook plunged from the higher onto the lower roof and that he did not simply slump or wilt and fall or roll onto the lower roof.
Dr. Smith states substantially that this is inconsistent with myocardial failure and is consistent with his theory-that it was the fall that caused the death.
Dr. Smith was of the opinion that there was a brain concussion which caused the death. We think it fair to say that a brain concussion is a brain injury. He says that there may be a brain concussion sufficient to cause death without visible evidence of injury. Dr. Covey is in disagreement with him on this point. Dr. Covey states that there can be no injury to the brain sufficient to contribute to death which could not be revealed by a microscopic examination.
Dr. Covey further said that death caused as he says this one was caused would not be so instantaneous as not to permit the raising of the hands and the uttering of the expression, “Oh, gee.” He also stated that the sort of death described by him resulted in sudden death to 11 per cent, of the individuals at the primary attack. He also said that in all probability the death was as sudden and instantaneous as death ever is. He said that in such cases they just fall like a person fainting, they just crumple and go down; they do not necessarily fall forward or backwards. His explanation of what he means by instantaneous death is the following: “Instantaneous death does not mean they are dead in an instant. They become unconscious,' they may move, they may gasp, their hearts may beat for a considerable period of time, and yet those must be classified as instantaneous deaths, if that term can be used.” A further definition assented to by him is the following: “That condition where almost instantly the condition of the patient becomes irretrievably fatal, although there is activity of the cells and spasmodic function of the organs may persist over a varied period of time, from several seconds to many minutes thereafter.”
*262He further stated that in his opinion Mook was to all intents and purposes dead before he hit the second roof, sufficiently dead so that he could not react in such way that he would do anything to help himself. Again he said that he might move, he might gasp, he might have convulsions, movements of his extremities, or something of that sort, but he would be essentially dead as far as the heart and the nervous system were concerned. On the question of the heart Dr. Covey said that the heart might beat thirty minutes after he was actually dead for all intents and purposes. With regard to the beat claimed to have been found by the fire chief Dr. Covey said: “That might well be. Hearts do beat for a long time after the patient is essentially dead.”
On the question of performance of occupational duties preceding death caused as Dr. Covey states that this one was caused, he said that the performance of ordinary daily duties is not inconsistent with this kind of death.
It is upon these two opposing opinions as to' the cause of death of Albert L. Mook, fortified as outlined, that this court is required to make a determination of this case. The determination must depend upon the question of whether or not the plaintiff has established by a preponderance of the evidence that Mook sustained an injury, which caused his death, arising out of and in the course of his employment, which proof must be made by evidence leading either to a direct conclusion or a legitimate inference that such is the fact. Holtzendorff v. Eppley Hotels Co., 140 Neb. 525, 300 N. W. 411; Feeney v. City of Omaha, 140 Neb. 497, 300 N. W. 571; Rose v. City of Fairmont, 140 Neb. 550, 300 N. W. 574; Lange v. Department of Roads and Irrigation, 141 Neb. 167, 3 N. W. (2d) 194.
It is our opinion that the plaintiff has failed to sustain the burden imposed upon her by the law. When the testimony supporting the opposing views is weighed one against the other we find it much less difficult to accept the view of the defendant than of the plaintiff. This alone would require a reversal of the award. There is another and cogent reason why the award cannot be sustained.
*263The statute (section 48-152 Comp. St. Supp. 1941) defines an accident within the meaning of the workmen’s compensation laws as: “The word ‘accident’ as used ■ in this Act, shall * * * be construed to mean an unexpected or unforeseen event happening suddenly and violently, with or without human fault, and producing at the time objective symptoms of an injury.” In the same section of the statute injury is defined as follows: “The term ‘injury’ and ‘personal injuries’ shall mean only violence to the physical structure of the body and such disease or infection as naturally results therefrom.”
Disregarding for the moment the contention or the evidence on behalf of the defendants and assuming the truth of all of the evidence of the plaintiff there is proof of accident but there is a lack of evidence of violence to any physical structure the consequence of which could have caused death as Dr. Smith contends that it was caused. More explicitly, there was evidence that there were facial injuries which indicated violence to physical structures but Dr. Smith appears to attach to them no particular significance except as evidence of a severe fall. It was from the evidence of the fall coupled with the evidence of a pulse, rather than violence to physical structures that Dr. Smith concluded that there was a brain injury or concussion. His opinion contemplates an entire lack of evidence of violence to the brain or any other physical structure surrounding or functioning with the brain.
On the basis of plaintiff’s testimony there has been a failure to establish by the quality of proof required by law that the death of Albert L. Mook was accidental within the meaning of the workmen’s compensation law. The cause of death on this evidence remains in the realm of speculation and conjecture.
This court has said: “When an employee dies suddenly and mysteriously while engaged in his work, the burden of proof that his death was an accident arising out of his employment rests upon the claimant for compensation, and such proof must amount to something more than mere *264guess.” Mullen v. City of Hastings, 125 Neb. 172, 249 N. W. 560; Shamp v. Landy Clark Co., supra.
The'mystery involved in this statement cannot with reason be limited to a lack of view by witnesses of the incidents culminating in death as was true in the cases cited, but must embrace also the factor or thing which produced death. A death, within the meaning, of this pronouncement, may be as mysterious as to cause, with witnesses observing the incidents leading to it as without.
It is therefore our opinion that the award and judgment of the district court are not supported by sufficient evidence and in consequence they are reversed and the action dismissed.
Reversed and dismissed.