Scope and Contents Warning: graphic content of surgical operations on research dogs.A silent black and white film detailing gallbladder reaction to injections of cholecystokinin. Apparatus for measuring gallbladder pressure used to record pressure movements in research dogs. Diagrams and close-up photography detail use of apparatus. Three research dogs given injections and observed through photography and x-ray, all subjects show gallbladder evacuation. Human subject with pericholecystitis also...

Scope and Contents Silent, black and white film depicting the scientists who attended the 13th International Congress of Physiology at Harvard Medical School in Boston in August 1929. The scientists mingle and talk outside in the quadrangle of the school. Intertitle cards identify the scientists and describe their affiliations and research. The film ends with panoramic views of the medical school’s buildings.Scientists include: Reel 1 - Nathaniel Kleitman of the University of Chicago; Henri Piéron...