The appellant mates five contentions, viz.: (1) that the plaintiff was guilty of contributory negligence as matter of law; (2) that the engineer of the engine was not acting within the scope of his employment when the accident happened; (3) that the court erred in refusing to receive evidence tending to show that plaintiff was employed in interstate commerce at the time of his injury; (4) that the court erred in admitting in evidence proof as to pulmonary tuberculosis, and in failing to instruct the jury that there was no evidence that the accident caused his tubercular condition; and (5) that the damages are excessive. These contentions will be discussed in their order.
1. The first contention is based principally upon the plaintiff’s own admissions to the effect that he did not look to the *644south to see whether an engine was coming before he started to walk northward, that he knew it was dangerous to walk northward from the pit, either on the track or close to the track, because it was a common occurrence for an engine to move along over this space without giving the proper signals, and that notwithstanding this fact and the fact that he could not see to the southward he started to cross the track. In addition to these admissions the defendant insists that the plaintiff’s claim that he listened and could not hear the natural and necessary noises of the engine as it approached is incredible.
These considerations were certainly amply sufficient to justify the jury in holding the plaintiff guilty of contributory negligence, but the question whether they would justify the court in so holding is a very different one. The plaintiff’s testimony went further, however. He testified (and in this he is fully corroborated by other testimony) that a yard regulation, existed requiring incoming engineers to stop their engines and leave them for the “engine dispatchers” to take charge of before reaching the cinder pit; that as he walked northward he walked west of the track in a beaten path and not on the track itself; that he stopped before attempting to cross the track and while he was still in a place of safety (namely, the clearance space between the track and the coal shed), and listened for somewhere from two to four or five seconds; that he heard no engine nor engine bell; that the only sound he could hear was a hissing noise which he thought was the noise produced by the throwing of water on the hot cinders in the pit, that he concluded that everything was clear, and then started to step across the track.
We are unable to say that this testimony is incredible. We suppose it is matter of common knowledge that a “drifting” engine frequently makes little noise. It may well be that under circumstances such as were testified to here, the noise of the relief valve of such an engine might be so *645merged into the hissing of the water being thrown npon the cinders as to he indistinguishable. Taking into consideration the fact that there was a yard regulation requiring the stopping of all engines south of the pit and the further fact that yard men must necessarily he frequently upon and about the tracks in the performance of their duties, we are unable to say that the plaintiff’s conduct here was negligent as matter of law.
2. The engineer of the locomotive testified that he knew’ of the bulletin requiring engines to stop south of the pit to he delivered to the “engine dispatcher,” but that he took his engine north to save himself walking; that he had to go to the roundhouse to leave his clothes, and that he always took his engine north as far as the water tank if there were no engines there, and the “engine dispatcher” received it at that place. From these facts it is argued that the engineer was not only disobeying orders, hut was not within the scope of his employment, hence that his master is not responsible for his negligent act. The contention is clearly untenable. The engineer’s duty was to deliver his engine to the “engine dispatcher.” He was directed to do that at a certain place, hut he chose to do it at another place. In so doing he violated orders, hut was still within the scope of his employment. This subject has been gone over so recently that it is unnecessary to enlarge on it again. The principle is that if a servant is endeavoring to forward his master’s business, but is guilty of- negligence or even violation of orders in his endeavor, he will violate his duty to his master, but he will still be within the scope of his employment so far as third persons are concerned. Were it otherwise there would apparently he no redress against the master for injuries received by third persons at the hands of negligent or disobedient servants. Ratcliffe v. C., M. & St. P. R. Co., ante, p. 281, 141 N. W. 229.
3. The complaint does not allege that the defendant was *646engaged in interstate commerce, or that the engine in question bad been handling an interstate train, bnt simply that the defendant was operating trains and was carrying passengers and freight for hire between Antigo and other cities and villages in Wisconsin. Neither did the plaintiff’s evidence show that the defendant was transacting an interstate business. When the defendant took the case, however, it offered to show that it and its trains, engines, and employees were engaged in hauling cars of freight continuously over this line between points in Illinois, Michigan, and Wisconsin at and prior to the time of the accident; that the engines which were being dispatched at this roundhouse at the time in question were making trips through Michigan to Ashland, making connections with the Watersmeet branch; that the engines running south wouldn’t run outside the state; that those going and coming from the south handled refrigerator cars from Chicago. No offer was made to show that the engine in question had been hauling an interstate train or interstate freight, nor that all the engines dispatched at this roundhouse hauled interstate freight or interstate trains. Part of this testimony was received against objection, but ultimately it was all stricken out, and so the question whether the federal Employers’ Liability Act controlled the present case was eliminated from the case.
An attempt is made by the respondent to justify this ruling on the ground that the testimony was incompetent and immaterial, because there is no claim made in the answer that the plaintiff was employed in interstate commerce at the time of his injury. We should be slow to hold to so strict and technical a rule. The statutes of the United States are the law of the land, and not like the statutes of our sister states which must be pleaded and proven in order to be available. Furthermore, the fact that the great railroad systems of the state are continuously engaged in both kinds of com*647merce must, we tbink, be so well known as to be matter of common knowledge. We do not find it necessary to decide this question, however, as we are of opinion that the ruling was right on the merits. As it was pointed out in the recent case of Ruck v. C., M. & St. P. R. Co., ante, p. 158, 140 N. W. 1074, it is necessary, in order to bring a case within the federal act, not only that the employer be engaged in interstate commerce, but that the injured employee shall suffer his injury “while he is employed” in interstate commerce. Taking care of an engine after it has completed its run and preparing it for the roundhouse seems very like repairing it, and we have just held that a servant is not employed in interstate commerce who is simply repairing an appliance which may be used for either kind of commerce, but which is not at the time of the repair in actual use in facilitating interstate commerce. Ruck v. C., M. & St. P. R. Co., supra.
We think there is a stronger ground, however, upon which the ruling of the trial court may be sustained. It appears that the plaintiff at the time of the accident here was walking back to his rest shanty, and was doing nothing at all in the way of dispatching engines. Now it may perhaps be correctly held (though we do not decide the question) that a man whose day is spent in dispatching engines all of which are engaged in interstate commerce is in legal effect employed in interstate commerce during the whole day and including the periods of leisure or rest when he is doing nothing but waiting for the arrival of an engine; but if, on the other hand, part of the engines dispatched be engaged in interstate business and part in local or intrastate business, we are unable to see how it could be logically said that he was “employed in interstate commerce” all day or during his intervals of leisure. In the present case, as we have seen, there was no offer to show that all the engines dispatched daily by *648the plaintiff were engaged in interstate commerce. As said before in tbis opinion, we think it must be considered a matter of common knowledge tbat tbe great railroad systems of tbe present day are engaged in botb interstate and intrastate commerce all tbe time and side by side. Tbe offer of proof in tbis case went little, if any, further than tbis. It-was noticeably guarded and indefinite in its purport. Every word of it might be admitted to be true and yet it would not be shown tbat all tbe engines dispatched at tbis roundhouse by tbe plaintiff were engaged in interstate business, nor even tbat tbe engine in question bad been so engaged. Tbe offer should have been so definite and certain as to apprise tbe trial court of tbe fact tbat tbe proof so offered would tend to establish tbe fact tbat tbe plaintiff’s entire work consisted of tbe dispatching of engines engaged in interstate commerce. Error must,appear affirmatively, — it is not to be presumed. We conclude, therefore, tbat there was no error in these rulings.
4. It appears from tbe evidence tbat tbe plaintiff received severe bruises, wounds, and contusions on tbe bead, body, and hips at tbe time of tbe accident; tbat several ribs were broken, and tbat be was in bed two weeks; tbat bis left arm is still partially paralyzed; tbat be suffers pain in tbe left arm and shoulder practically all tbe time; tbat be is incapacitated for physical labor; is afflicted with occasional spells of dizziness; and tbat bis average weight’ is reduced from about 160 pounds to about 130 pounds. Tbe injury was suffered in January, 1911. He was examined by Dr. Connell of Eond du Lae in May, 1912, and it was then found for tbe first time by examination of bis sputum tbat be bad incipient consumption or tuberculosis of tbe lungs. He testified himself tbat be bad bad night sweats and hemorrhages. Tbis testimony was received against objection, and tbe court refused to instruct tbe jury, as requested by tbe defendant, tbat they could not find tbat tbe accident caused tbe pulmonary tuberculosis *649from which the plaintiff is suffering. The defendant’s contention is that there is ho sufficient evidence to establish any causal relation between the physical injury and the tuberculosis which existed more than a year later, .and that the relationship between the two is purely conjectural. There was medical testimony to the effect that an injury such as plaintiff received is likely to induce or incite tuberculosis by reducing the natural resistance of the patient, lowering his vitality, and putting him in a condition whereby he is unable to withstand infection. If this testimony were the only testimony tending to show a causal relation between the injury and the tuberculosis we should agree with the defendant’s contention. If decreased powers of resistance resulting from an injury are to be considered as a link in the chain of causation between the injury and a disease developing years afterward, it is very evident that a large, if not an almost limitless, field is opened up for speculation by juries in a region where there can be no guide and no probability of just results.
In the present case, however, there was other testimony besides the general testimony above referred to. Dr. E. J. Donohue, who treated the plaintiff for his injuries from the day of the accident in January, 1911, until some time in April following and gave him a thorough physical examination, including an examination of the sputum, about two weeks before the trial in July, 1912, testified directly as follows:
“Such an injury as the one he sustained would cause tuberculosis. It would decrease the resisting forces, tend to give a chance for infection, and give it a chance to loom up. In other words, this germ that is dormant or inactive would or can become active. In my opinion the tubercular condition that I found is the result of this injury, and he is permanently disabled from manual labor.”
Here is direct testimony by the physician who treated the plaintiff for his injuries for months, and presumably knew *650more of tbeir nature and extent than any one else. It appears that he had known the plaintiff for years and had treated his family. He must have been in a favorable position to judge of the actual as well as the probable effects of such an injury upon the plaintiff. He testified positively that in his opinion the tubercular condition was the result of the injury received. We are unable to say that this testimony is beyond the proper scope of expert medical testimony, and unless we can say that it seems certain that we cannot hold that a finding that the tubercular condition was caused by the accident is purely conjectural.
There are no other contentions which require treatment.
By the Court. — Judgment affirmed.