CHARTS AND THEIR EXPLANATIONS. 



IOI 

 Chart XLI. 



220 



200 



180 



160 



140 



120 



70 

 50 

 30 



in 



E 



20 40 60 80 100 120 140 160 180 200 220 240 260 



Days 



Chart XLII. 



Chart Xlyll (rat 103, male) shows the influ- 

 ence of a diet of isolated food-stuffs containing 

 casein as the sole protein. The satisfactory pre- 

 vious nutritive condition of the animal is shown 

 during period 1 on mixed food. Casein feeding 

 was begun with period 2 ; and the favorable 

 effect of faeces of normally fed animals is shown 

 during period 3. The composition of the food 

 in periods 2 and 3 was as shown in table. 



P.ct. 



Casein 18.00 



Starch 25 . 00 to 32 . so 



Sugar 12.87 25.37 



Agar 0.00 5.00 



Salt mixture 4.13 



Lard 20.00 35-00 



The salt mixture, which was prepared 

 for other purposes, consisted of the 

 citrates of calcium, magnesium, 

 sodium, potassium, and iron, and the 

 chlorides of sodium and potassium. 



