This is an action to recover for personal injuries sustained by the plaintiff while in the employ of the defendant. The case was submitted to the jury on the fourth count of the declaration which alleged, in substance, that on June 29, 1929, the defendant carried on the business of quarrying and crushing stone, and the plaintiff was in its employ; that the defendant by the use of power drills bored holes in stones and ledges and blasted stones and ledges by exploding dynamite sticks inserted in the holes; that after each such explosion and blasting it was a part of the work of the plaintiff and others to go upon the ledges and among stones on the defendant’s property *474and drill holes in the stones after blasting the same; that it was further a part of the plaintiff’s work to clean out and complete the drilling of holes that had either been incompletely drilled or not been used and had thereafter become filled with particles of stone or dust or other materials; that the defendant knew, and in the exercise of due care should have known, that the plaintiff was engaged in such work and should have provided adequate inspection of the place where the plaintiff carried on his work, especially with reference to the presence of any unexploded dynamite in such drilled holes in the rocks or ledges; that the defendant had a system of inspection of such stones and ledges with reference to explosions but it was negligently inadequate, and on June 29, 1929, while the plaintiff was at work in the manner in which the defendant had instructed him, the agent or servant of the defendant entrusted with the duty of inspecting the place in question so negligently performed his work that a quantity of dynamite was permitted by him to remain concealed by fine dust, small stone and other material in a hole in a rock, without any warning being given or any care being taken by said inspector of the presence of the explosive; and that while the plaintiff in the course of his work was cleaning out and drilling further into the hole, the drill came in contact with the dynamite which exploded and the plaintiff was injured. It is further alleged in the fourth count that “the defendant was not a subscriber to the workmen’s compensation act . . . .”
At the close of the evidence the defendant filed a motion for a directed verdict in its favor, which was denied, and the defendant excepted.
It appears from the evidence that the defendant was engaged in quarrying stone out of a ledge on its premises, causing it to be thrown down on to the floor of the quarry; that some of the pieces were so large that they could not be broken up in a stone crusher to a size suitable in the construction of highways for which they were intended ultimately to be used, and had to be reduced in size by other charges of dynamite. The plaintiff was a jackhammer *475driller, so called, and he with five others was employed to drill holes in such pieces, and thereafter it was the duty of another employee, called a loader, to put the necessary amount of dynamite in the holes, attach a fuse and cap to the same, fill each hole with stone dust and tamp it. Nothing then would be seen except the fuse, from which it would appear whether there was dynamite in the hole or not. Then the jackhammer driller would ignite the fuse and cause the dynamite to be exploded. This was done just before noon and just before quitting time, which was about five o’clock in the afternoon.
The plaintiff testified that he was twenty-six years of age, and began work for the defendant in the spring of 1928; that he worked all over the plant but did not do any drilling that year; that in 1929 he used the jackhammer driller which made small holes approximately one inch in diameter; that the man who drilled the hole had nothing to do with the dynamite except that when the hole had been loaded and tamped he exploded the dynamite by lighting the fuse; that previous to the day he was injured he had been directed by Joel Tardiff, who represented the defendant, to clean out any holes that had been drilled and become filled with dust and chipped pieces of stone; that he found such holes the day before he was hurt and cleaned them out; that they has been drilled by some other employee — any jackhammer driller finding such holes would clean them out; that he would find one or two such holes every day; that on the day he was hurt, after blowing the dust out of one of the holes and going down about three inches he found it was hard and “started to drill to make it deep enough for that size stone”; that he knew it was a drilled hole “but there was no fuse sticking out . . . the hole was filled with dust and chips of rock, but it was not filled level with the stone; that it was not filled three or four inches from the top”; that he knew he was at the end of the dirt because it was hard like a rock; that he started to drill and there was an explosion. He further testified that the loader was to blame for the accident because he was supposed to inspect the holes every night and at noon; that he could tell *476whether the hole had been loaded by the fuse; that there was no fuse in the hole; that if there had been it would have told him there was dynamite in the hole.
George Maso, a witness called by the defendant, testified that he was employed by the defendant, and had been so employed for the last eleven years; that he told the plaintiff that there was a rule forbidding jackhammer drillers to touch a hole that had been filled with dynamite and if he saw a hole in any stone he was not to touch it, whether there was dust in it or it was loaded, as possibly there was dynamite in it. On cross-examination this witness testified that the rock which exploded was about twice the size of the court reporter’s desk; "that he was the only loader on this type of work; that he had to load the holes that six men drilled, that he had to inspect the work of six jackhammer drillers, to inspect the holes that had been drilled; that his job was to go out and see the result of each blast; that if a hole had not exploded it was his job to inspect, it and see why it didn’t explode and put in a new fuse; that if a man was drilling a hole and was down three or four inches and the whistle blew he would leave it, but he would not always go back and finish that particular hole in the morning . . . that if there was a hole in the stone it was the man’s duty to speak to him about it; that if a man found a hole in a stone he is supposed to send for him; that if there was dynamite in the hole the jury may assume that he, put it in the hole; that he loaded the particular stone; that he thought the fellow had tamped it but he did not see him do it; that the reason somebody did not discover that the hole was filled the night before was because - he had other work to do, he was very busy; that if he had found the hole the night before, he would have put a new fuse in there; that if he came along and found a hole in the stone such as is described by the plaintiff that would negative the fact that there was dynamite in the hole; that he would inspect it; that if dynamite was put in the holes and dust put on top of it, but not tamped it was unintentional; that they would be tamped subject to his directions; that the dynamite goes in the hole first and then the dust; that the man who tamped *477it would follow after him; that he would leave the string protruding above the top of the hole about three or four feet outside; that he never put dynamite in a hole without putting a string on it; that it is possible that tamping was not done at times; that fuses are sometimes cut by sharp stones; that a hole not tamped would look entirely different than a hole that had been filled and tamped; that the amount of dynamite to be put in a hole would depend upon the size of the hole, the depth of the hole; that he told the plaintiff never to put his jackhammer drill in a hole that had been drilled.”
It was assumed at the trial that the defendant was not a subscriber under the workmen’s compensation act. Although an allegation in the declaration to that effect was not required, and the presiding judge should have stated to the jury that it had no bearing upon any issue involved in the case, there was no prejudicial error. See Chaves v. Weeks, 242 Mass. 156, 158.
The evidence warranted a finding that the plaintiff was injured while engaged in work which he was required to do, namely, to clean out an unfinished drill hole which had not been tamped and required further drilling; that there were dust and chips of rock in the hole which it was his duty to remove. It could have been found that no fuse or string was connected with the hole to indicate to the plaintiff that the hole had been charged with dynamite. In these circumstances it could have been found that the plaintiff in further drilling the hole was acting in accordance with the requirements of his work. The evidence warranted a finding that all the holes had previously been properly inspected by Maso, a fellow servant, and that no dynamite had been left in any other hole.
There is no contractual assumption of risk, as the plaintiff’s case rests upon the negligence of a fellow servant. Demaris v. Van Leeuwen, 283 Mass. 169, and cases cited. The rule that an employee assumes the risk of what is obvious in the place where he voluntarily consents to work does not apply to concealed dangers. It was said by Knowlton, J., speaking for the court in Hopkins v. O’Leary, 176 *478Mass. 258, at page 264: “While the plaintiff assumed the obvious risks of the business, he did not assume the risk from the failure of the defendant, either personally or through a superintendent, to perform the ordinary duties of an employer in providing against unnecessary or concealed dangers in places in which laborers were set to work.” The defendant, not being insured under the workmen’s compensation act, could not rely upon the defences that the plaintiff’s injuries were caused by his own negligence or by the negligence of a fellow servant, or that the plaintiff had assumed the risk of the injury. Cronan v. Armitage, 285 Mass. 520. In Cogliano v. Ferguson, 228 Mass. 147, it was held that, if the plaintiff was ignorant of any danger arising from an unexploded charge of dynamite, he did not assume the risk of such hidden danger. The case of Welch v. Grace, 167 Mass. 590, is plainly distinguishable upon the facts there shown from the present case.
Upon the evidence the jury were warranted in finding that the plaintiff’s injuries were due to the negligence of Maso, his fellow servant, in failing to inspect the 6hole in which the explosion occurred and in not placing therein a new fuse as a warning to him. The reason given by Maso as to why someone did not discover the night before that the hole was filled was that he had work to do and was very busy, and warranted a finding that he made no inspection of the hole in question, that such failure was due to his negligence, and that for his negligence the defendant was responsible. It is plain from the entire evidence and the reasonable inferences that the defendant’s motion for a directed verdict in its favor could not properly have been granted.
The defendant’s foreman, one Tardy, was asked on cross-examination by counsel for the plaintiff, “And you want to be boss, don’t you?” The defendant excepted to the admission of this question, but he was permitted to answer it on the ground of possible bias. It has frequently been held by this court that the limits and scope of cross-examination are largely within the discretion of the trial *479judge. This exception must be overruled. Hanley Co. Inc. v. Whitney, 279 Mass. 546, 557.
The defendant excepted to the instruction of the judge in which he stated, in substance, that if the jury found that the plaintiff at various times put his drill in holes and blew them out, and that the defendant through its loader Maso, or its foreman Tardy, knew that the plaintiff was putting his drill in the holes and blowing them out in violation of the general rule and his directions to him, it was for the jury to determine whether it waived the directions not to put a drill in the holes. We are of opinion that in view of the evidence this instruction was not erroneous. It could have been found that the rule originally in force had been waived by the defendant and that the plaintiff knew it was no longer in force. McNee v. Coburn Trolley Track Co. 170 Mass. 283. Sweetland v. Lynn & Boston Railroad, 177 Mass. 574, 579, 580. Cutts v. Boston Elevated Railway, 202 Mass. 450, 456. Von Ette’s Case, 223 Mass. 56, 60. Farber v. Mutual Life Ins. Co. 250 Mass. 250, and cases cited.
As no error appears in the conduct of the trial the entry must be
Exceptions overruled.