FEEDING EXPERIMENTS WITH ISOLATED FOOD SUBSTANCES. 



23 



100 120 



180 200 



Days 



220 240 260 80 



300 320 



340 3fc0 



Chart V. 



-Rat 18 fed on Hempseed-Lard Diet for 322 days. Numbers on body-weight line 

 indicate time at which each period began. 



Other trials with the same diets frequently led to a decline in 

 weight and a loss of body protein. In nearly all of these cases the 

 insufficient food-intake was adequate to explain the incipient symp- 

 toms of inanition. Our numerous attempts to vary the flavor of the 

 food and thus increase its palatability have been without striking 

 success. Under exactly similar conditions of diet and environment 

 different rats may continue to exhibit markedly unlike appetite for 

 the same food. It seems best in the present stage of our knowledge 

 to exclude from the diet experiments all animals which exhibit what 

 seems like a temperamental anorexia. Protocols from some of these 

 experiments are recorded here for comparison. 



Rats xxviii and xxix were fed throughout the entire period 

 on the dog biscuit-lard mixture with the results shown in tables VI 

 and VII. 



