Top: Dr. Horace Wells Day Book, May 13, 1841 - November 5, 1845.
Left: H. Wells, An Essay on Teeth, Case, Tiffany & Co., Hartford, 1838
Right: G.Q. Colton, A True History of the Discovery of Anaesthesia, A. G. Sherwood & Co., N.Y. 1896
Dr. Wells' Day Book is open on the page indicating the March 4, 1844 entry: 'To operations on teeth and instruction in the Art of Dentistry per agreement $40.00', addressed to Dr. W.T.G. Morton and notarized by H.L. Rider, Notary. See lower right area of opened Day Book.