Where, after a contract of sale was signed by the vendor, the purchaser made material alterations and then signed it, and the vendor refused to re-execute, there was no meeting of minds and the broker can not recover commissions. Bruce v. Hurlbut, 66 N. Y. S. 1127, 54 App. Div. 616. See also Sec 33. A contract for the sale of land was executed by the owner and left with his agent for the sale of such land for delivery to the purchaser; the agent altered the instrument by substituting the name of another person, changed both the consideration and the rate of interest, and delivered it to such other person. Held, that the contract so delivered was not the contract of the owner. Ballou v. Berg-vendsen, 9 N. D. 285, 83 N. W. 10; Campbell v. Chase, 96 P. 959, 78 Kan. 593. See also Sec. 55.