Science of Chiropractic 1920 VOLUME 2: The Science of Chiropractic, Bartlett Joshua Palmer. Davenport, IA:1920. illus.; photos; 679 pp. Volume 2 on spine. No Table of Contents. Index pp.678-679. No Advertisements. Frontpiece: B.J. Palmer and Mabel Heath Palmer. This edition is actually a second edition and is a combination of the 1907 volume two and the 1908 Causes Localized, volume four. The science of chiropractic; containing a series of lectures and other scientific material discovered or developed and delivered by B.J. Palmer. There is additional information on the sympathetic nervous system, reflex action, and serous circulation. New topics include physiology, cranial nerves, infantile paralysis, stones, hemorrhage, tumors, biology, the Meric System and equations. This is a revision of the 1913 text with new information on the Meric System and equations.