companies are thereby put into a class to themselves and deprived of the benefit of the general rule of law which places upon one who sues in tort the burden of not only proving an injury, but also that the injury was the consequence of some negligence in respect of a duty owed to the plaintiff.
It is to be primarily observed that the statute is not made applicable to all actions against such companies. Its operation is plainly limited, first, to injuries sustained by passengers or employés of such companies; second, to injuries arising from the actual operation of railway trains or engines, and third, the effect of evidence showing an injury due to the operation of trains or engines is only “ prima fade evidence of the want of reasonable skill and care on the part of the servants of the company in reference to such injury.”
The law of evidence is full of presumptions either of fact or law. The former aire, of course, disputable, and the strength of any inference of one fact from proof of another depends upon the generality of the experience upon which it is founded. For a discussion of some common law aspects of the subject see Cincinnati &c. Ry. v. South Fork Coal Co., 139 Fed. Rep. 528 et seq.
Legislation providing that proof of one fact shall constitute prima facie evidence of the main fact in issue is but to enact a rule of evidence, and quite within the general power of government. Statutes, National and state, dealing with such methods of proof in both civil and criminal cases abound, and the decisions upholding them are numerous. A few of the leading ones are Adams v. New York, 192 U. S. 585; People v. Cannon, 139 N. Y. 32; Horne v. Memphis &c. Ry., 1 Coldwell (Tenn.), 72; Meadowcroft v. The People, 163 Illinois, 56; Commonwealth v. Williams, 6 Gray, 1; State v. Thomas, 144 Alabama, 77.
We are not impressed with the argument that the Supreme Court of Mississippi, in construing the act, has de