In Atlantic Coast Line R. Co. v. Burnette, 239 U.S. 199, at 201 (1915), Mr. Justice Holmes wrote: ". . . But irrespective of the fact that the act of Congress is paramount, when a law that is relied on as a source of an obligation in tort, sets a limit to the existence of what it creates, other jurisdictions naturally have been disinclined to press the obligation farther. . . ."