CHARTS AND THEIR EXPLANATIONS . 



99 



Chart XXXVIII. 



Oead.causei 

 unknown 



Chart XXXVIII 

 (rat 50) shows main- 

 tenance for 158 days 

 on a diet in which 

 casein formed the sole 

 protein. The com- 

 position of the food 

 was as shown here- 

 with: 



p. ct. 



Casein 18.0 



Starch 29.5 



Sugar 15.0 



Agar 5.0 



Salt mixture I. 2.5 



Lard 30.0 



20 



60 



80 100 120 



Days "' 



140 160 



Chart XXXIX. 



20 



40 



60 



80 



100 



120 



Days 



140 



160 



180 



200 



220 



240 



260 



Chart XXXIX (rat 145, female) shows the effect 

 of feeding a diet of isolated food substances in which 

 casein formed the sole protein. Period 1 represents 

 the normal growth of the animal on a mixed food. 

 The casein feeding began with period 2. The influ- 

 ence of faeces of normally fed animals in preventing 

 decline in body-weight is shown during period 3. As shown by the food 

 intake, the favorable effect is not due to an increased consumption of food. 

 The diet during period 1 consisted of mixed food; during periods 2 and 3 

 as shown in table. 



Periods 2 and 3. 



p. ct. 



Casein 18.0 



Starch 32.5 



Sugar 2i.oto26.o 



Agar ,o.o 5.0 



Saltmixturel 2.5 2.6 



Lard 20.0 25.0 



