I hereby acknowledge that I have this day purchased, at public auction, all that [describe property], for the sum of ---------dollars, and have paid into the hands of X. Y. (the auctioneer) the sum of --------- dollars, as a deposit and in part payment of the purchase money; and I hereby agree to pay the remaining sum of---------dollars unto A. B. (the vendor), at---------, on or before the--------day of---------, 19_; and in all other respects, on my part, to fulfill the annexed conditions of sale.

In witness whereof, etc.

See references under Sec. 3800.