Samuel Blatchford, Coler v. Cleburne — Opinion of the Court
“ The authority of a public agent depends on the law as it is when he acts. He has only such powers as are specifically granted, and he cannot bind his principal under powers that have been taken away, by simply antedating his contracts. Under such circumstances, a false date is equivalent to a false signature; and the public, in the absence of any ratification of its own, is no more estopped by the one than it would be by the other. After the power of an agent of a private person has been revoked, he cannot bind his principal by simply dating back what he does. ”
