SMITHSONIAN CONTRIBUTIONS TO KNOWI.KlXil 



RESEARCHES 



YENOM OF THE RATTLESNAKE 



WITH AN INVESTIGATION OF THE ANATOMY AND PHYSIOLOGY 

 OF THE ORGANS CONCERNED. 



S. WEIR MITCHELL, M.D., 



LECTCKER ON rHVSIOLOGY IN THE I'lilLAIlELPIJI A MEDICAL ASSOCIATION. 



[ACCEPTED F O It PUBLICATION, J UL V , 1 8 t) . ] 



