CLEMENS, SAMUEL LANGHORNE. Christian Science. With Notes Containing Corrections to Date. New York and London: Harper 1907. 8vo, original red cloth, spine slightly faded with two tiny stains, small stain on front cover, light news-clipping offset on front endpaper, half morocco slipcase. FIRST EDITION, FIRST STATE, frontispiece (dated 1906) and two illustrations, PRESENTATION COPY, inscribed by Clemens on the front paste-down endpaper: "To Dr. Halsey with the Kindest regards of the Author. March 1907." The recipient, Dr. Robert H. Halsey, was one of two physicians who attended the terminally-ill Clemens (who had just returned from Bermuda) on the train journey from New York to his home in Redding, Conn., where he died on 21 April 1910 (see Albert Bigelow Paine, Mark Twain: a Biography, 1912, vol. 3, pp. 1573-1574). BAL 3497; Johnson/Clemens, pp. 87-89. Christian Science is Twain's hilarious lambasting of Mary Baker Eddy and her pseudo-religion. Bookplate of Dr. Charles Aden Poindexter.