Where one authorizes an attorney in fact, by power duly signed and acknowledged, to make a certain contract for the purchase of land with certain parties and of a certain date, and subsequently ratifies the action of his attorney, it is immaterial whether he knew all the terms and conditions of the contract at the time it was made, and he will be bound by the contract made by such attorney. Bank v. Garvey, 66 Neb. 767, 92 N. W. 1025, 99 N. W. 666.