Only the name of the principal should be used in the body of the instrument, as one of the contracting parties, the agent should then sign the principal's name to it, and then his own as agent. Mears v. Morrison, 1 Breese (I11.), 172; Bingham v. Stewart, 13 Minn. 106; Smith v. Morse, 9 Wall. (U. S.) 76.