 If he tells a lie on oath, the question as to whether or not such a statement is immaterial to the main issue before the court ought not to arise.This is because the lie was told in a ‘judicial proceeding,’ where he had sworn to say nothing, but the truth.So whether such deliberate falsehood, will corroborate evidence, as to make it a material statement, for the purpose of prosecuting the maker for perjury, should also not arise.