...enforcement. Canada did so August 29. 1917, and the United States did likewise by passing the Migratory-Bird Treaty Act which was approved by the President July...constitutionality of the treaty and the treaty-act can not he questioned, for the Constitution provides that "all treaties made or which shall be made, * * *...

...give effect to the convention, prohibited the killing, capturing or selling any of the migratory birds included in the terms of the treaty except as permitted by regulations compatible with those terms, to be made by the Secretary of Agriculture. Regulations were proclaimed...