A real estate broker employed to sell property procured from a prospective purchaser the following signed memorandum: "I authorize Mr. M. to offer $220,000 for Mr. K.'s house, corner of Sixty-fourth and Fifth Avenue, July 27, 1894, signed, J. T. Martin." Held, that it was at most a provisional proposition, leaving unexpressed essential details, and was to vague and uncertain to entitle a real estate broker procuring it to his commissions from the vendor, where the proposed purchaser refused to complete the sale. Montgomery v. Knickerbacher, 50 N. Y. S. 128, 27 App. Div. 117. See also Sec. 556.