Fig. 3.— (Upper photograph.) Dog showing polyneuritis with marked paralysis 

 of hind legs as result of diet lacking vitamin B. (Courtesy of G. R. Cowgill and 

 Professor Mendel and of the American Journal of Physiology.) 



Fig. 4.— (Lower photograph.) Dog shown in Fig. 3 cured by vitamin B given 

 in form of tomato juice. (Courtesy of G. R. Cowgill and Professor Mendel and 

 of the American Journal of Fhvsiolofiy.) 



