A broker is liable for the fraud of a sub-agent employed by him, and not in privity with the broker's principal. Barnard v. Coffin, 141 Mass. 37, C H". E. 364; Estes v. Crosby, 175 N. W. 933, amend, of man. den., 177 N. W. 512, - Wis. Sup. - . See also Sec. 25.