VlTAMINE ON THE NUTRITION OF DOGS. 



85 



form of casein or wheat gluten. It furnished about 70-80 calories 

 per kg. body weight. Such food mixtures were consumed readily 

 by the dogs during a period from three to nine weeks; thereupon 

 they began to refuse part or all of their food. Characteristic 

 symptoms, similar to those described by Voegtlin and Lake 1 were 

 developed by some of the animals. The ultimate failure to eat 

 was always noted. 



Ingestion of as little as 1 gm. of brewer's yeast, which had been 

 previously dried, will cause a quick recovery of the desire to eat. 

 5 gm. of the dried yeast will bring about the disappearance of the 

 polyneuritic symtoms in 8-12 hrs. and a quick recovery of the 

 animal to its normal condition. 



The utilization of the protein nitrogen is not effected by the 

 lack of water-soluble vitamine. 



Studies in metabolism on diets with and without vitamine are 

 being conducted. 



The fat-soluble vitamine is apparently of less importance than 

 the water-soluble in the nutrition of the adult dog. 



1 Voegtlin and Lake, Am. J. Physiol., 1918, xlvii, 558. 



