PAVLOV, IVAN. (1849–1936). Russian physiologist, psychologist, and physician; best known for his investigation of conditioned reflex through the use of experiments involving salivating dogs. He was awarded the Nobel Prize in Medicine in 1904. Exceedingly rare, Original German offprint of Pavlov’s article titled: “Die normale Tatigkeit und allgemine Konstitution ser Grosshirnrinde [The normal Activity and General Constitution of the Cerebral Hemispheres]. Skandin Archive of Physiology, 1923. Vol XLIV, Walter de Gruyter & Co, Berlin and Leipzig. Approx 6 x 9 inches, octavo. 10 pages. Boldly Signed by Pavlov, on the upper right corner “Vom Verfasser” [from/by the author]. Some pencil notations, and vertical fold from initial mailing, else very fine condition.