'She cannot be received as a witness. The father himself could not be a witness, because he shall not be suffered to defeat his own deed; and if he could not, neither san the wife, for she is not competent to prove a fact which he could not be admitted to prove. He relied on 1 Term, 230, and said he was not aware of any decision which had restrained the rule .'here laid «iowti to negotiable papers only.