It is the President upon whom the Constitution devolves, as head of the executive department, the duty to see that the laws be faithfully executed; but as he cannot execute them in person, he is allowed to select his agents, and is made responsible for their acts within just limits. So complete is the presumed delegation of authority in the relation of a head of department to a President, that the Supreme Court of the United States have decided that an order made by a head of department is presumed to be made by the President himself.