24 Ada Springer 



The individual records of two individuals do not agree entirely 

 w^ith the average results of the sets, as shown below: 



In. wt. Increment 



grams per cent 



No. (i) 1. 107 56.4 



No. (2) 1.632 43.3 



No. I was fed 40 times (105 mg. average per feeding), and No. 

 2 was fed 39 times. 



The general results of the experiments carried out to test the 

 effect of varying temperatures seem to show: 



1. More food is required at a high temperature to preserve 

 equilibrium than at a low temperature. 



2. The maximum amount of beef that the animals will take at 

 a low temperature is, on the average, one-third as much as for 

 those at the room temperature (20° or at 30° C). At a low 

 temperature digestion probably takes place more slowly, or it 

 may be less food is taken because waste is slow^er and less material 

 for repair is needed by the body. 



3. When a definite amount of beef was given to animals at three 

 temperatures, viz: 10° C, 20° C. and 30° C, this being the maxi- 

 mum amount that those at 10° C. would take, the rate of growth 

 was greatest at 10° C, less rapid at 20° C, and at 30° C. the beef 

 given was not sufficient to maintain equilibrium. When, how- 

 ever, the animals at 20° C. were fed their maximum amount (the 

 same as the maximum for those at 30° C), which was three times 

 as much as that given to the animals at 10° C, the percentage 

 increment w^as almost twice as great as that of the animals at 10° 

 C, and was greater than that at 30° C. The percentage increment 

 of animals at 30° C. was also greater on their maximum amount 

 of beef than that of the animals at 10° C. on their maximum 

 amount of beef. 



By comparing the ratios between the amounts of beef taken 

 and the percentage increments in the above cases, it will be found 

 that the rate of growth in proportion to the amount of food taken 

 is greatest at 10° C, less at 20° C, and still less at 30° C. 



