Morrison Waite,
United States v. Graham — Opinion of the Court
“ Justice WOODS, 'the practice * * * finds no higher warrant or sanction in the act of 1835 than in the act of 1876.' Such being the case, it matters not what the practice of the departments may have been or how long continued, for it can only be resorted to in aid of interpretation, and 'it is not allowable to interpret what has no need of interpretation.' If there were ambiguity or doubt, then such a practice, begun so early and continued so long, would be in the highest degree persuasive, if not absolutely controlling, in its effect. ”
