CHARTS AND THEIR EXPLANATIONS. 



8 9 



Chart XXIII (rat 48, male) shows the growth of the male rat from 

 early life, under cage conditions adopted for experimental feeding. The 

 animal was fed 452 days on mixed food, consisting of dog-biscuit, sunflower 

 and other seeds, fresh vegetables, and salt. 



20 40 60 80 100 120 140 160 180 



Days 



Charts XXIV (rat 166, female) and XXV (rat 156, female) show the 

 typical growth of female rats, including pregnancy, under cage conditions. 

 The animals were fed on mixed food. 



Chart XXV. 



