Summary

John McLean United States v. Macdaniel — Opinion of the Court

No government could be administered on such principles. To attempt to regulate, by law, the minute movements of every part of the complicated machinery of government, would evince a most unpardonable ignorance on the subject. Whilst the great outlines of its movements may be marked out, and limitations imposed on the exercise of its powers, there are numberless things which must be done, that can neither be anticipated nor defined, and which are essential to the proper action of the government.
Source: Wikisource

John McLean United States v. Macdaniel — Opinion of the Court

The language of the act of 1804 is such as to show clearly, that all the payments to be made at the navy department, which were made by the defendant, were to be made by the commandant of the navy yard. For this purpose, that office was created, and the officer appointed. When the law has fixed and established the duties of an officer, another person, or another officer, cannot be charged with them. When duties are not defined, and when any one has an appointment in a department, the officer at the head of the department may enlarge the duties of the subordinate, and they must be executed.
Source: Wikisource

John McLean United States v. Macdaniel — Opinion of the Court

That usage, without law or against law, can never lay the foundation of a legal claim, and none other can be set off against a demand by the government. A practical knowledge of the action of any one of the great departments of the government, must convince every person, that the head of a department, in the distribution of its duties and responsibilities, is often compelled to exercise his discretion.
Source: Wikisource

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