A Study of Groiuth 3 1 



of the animal, although from the data it is impossible to determine 

 whether it might not be due to some extent also to the stimulus 

 produced by the cut. Injury in this case reduces the weight of 

 the body without affecting the amount of food digested, therefore it 

 seems reasonable to suppose that less material is needed for repair 

 (there being less material to be repaired), and more goes to increase 

 the weight than is the case in normal control animals. 



4 The initial weight is the main factor in determining the 

 percentage increment or rate of growth; the greater the initial 

 weight the less the percentage increment; that is, the larger the 

 animal the more food is used for the actual maintenance of the 

 body material, and the less goes to an increase in weight. 



5 Sex may influence the rate of growth, but so far as the 

 data go only indirectly through the initial weight. The average 

 initial weights of the females were less than those of the males. 



6 After starvation and subsequent reduction in the initial 

 weight, the rate of growth is higher than in the normal animals. 

 This increase in rate is probably due to the reduction of the 

 initial weight. 



7 During starvation the rate of decrease in weight diminishes 

 as the temperature is lowered. 



8 If the maximum quantity of food the animals will receive at 

 the lower temperature be taken as a feeding basis, the rate of 

 growth diminishes with the increase of temperature; that is, the 

 rate is highest at the lower temperature and becomes lower as the 

 temperature increases. The quantity of food the animal will 

 take, however, increases with the temperature. It was found that 

 the quantity of food taken by the animals at the intermediate and 

 higher temperatures was three times that taken by those at the 

 lower. Taking as a feeding basis the maximum quantity of food 

 the animals will take at the intermediate temperature (which 

 was also that for those at the higher) the rate of growth diminishes 

 with the increase of temperature. The rates of growth at the 

 intermediate and at the higher temperatures on their own feeding 

 bases were both higher than that at the low temperature on its 

 feeding basis, but the difference m the rates was not in proportion 

 to the difference in quantity of food taken which was three to one. 



