Vendors under contract with broker for the sale of land, terms "one-half down, and the balance in five equal annual payments/' can not be required to accept payments by check, and they need not bind themselves to convey until this objection is removed by an offer at the time of a different method of payment, reasonable in character and satisfactory to them. California Land Security Co. v. Ritchie, 180 P. 625, - Cal. App. - .