Where the assignee of certain real estate brokers sued in assumpsit to recover compensation for a broker's services rendered under a written contract with defendant, which defendant had cancelled before the termination of the contract term, the contract was admissible in evidence. Breen v. Boy (Cal. App. '08), 97 P. 170; James E. Carlson, Inc. v. Bailer, 174 N. W. 824, - Minn. Sup. - .