WOVEMBER 24, 1911] 



SCIENCE 



121 



Days 



Fig. 3. (Taken from Carnegie Publication No. 156, page 49.) This rat was fed 69 days on 

 a diet containing casein and glutenin as the sole proteins, followed by a period of 259 days in 

 which glutenin formed the sole protein of the diet. Only a portion of the duration of this 

 experiment is reproduced in the figure. 



FlO. 4. (Taken from Carnegie Publication No. 156, page 45.) This rat was fed 210 days 

 on a diet containing casein and excelsin as the only proteins. 



