2. In order to make a good subscribing witness, it is requisite he Should sign his name to the instrument himself, at the time of its execution, and at the request or with the assent of the party. 6 Hill, N. Y. R. 303; 11 M. & W. 168; 1 Greenl. Ev. §569 a, 4th ed. See Witness instrumentary; 5 Watts, 399.