22 Ada Springer 



After a period often weeks the results were as follows: 



Increment 

 per cent 



Set D H-8 



Set Di 12-5 



Set D- there was a loss of 14.4 



The amount of food in case of the set at I0° C. was sufficient to 

 give a percentage increase of 24.8; the same amount at 20° C. 

 gave only 12.5 per cent; while at a temperature of 30° C. it did 

 not prove sufficient to preserve equihbrium, a loss of 14.4 per 

 cent was the result. 



The individual records of three animals from each set were 

 kept; the initial weights with the percentage increments being 

 as follows: 



SET D (table XXi) SET d' (tABLE XXll) SET D^ (tABLE XXIIi) 



In. wt. Increment In. ivt. Increment In. wt. Loss 



grams per cent grams per cent grams per cent 



No. (i).... 1.374 20.5 No. (i).... (lost) No. (i) ... 1.037 -12.5 



No. (2).... 1.947 21.4 No. (2) ... 1.297 37-3 No. (2).... 1.389 (gain) 2.4 



No. (3).... 2.232 8.4 No. (3).... 2.007 -16.5 No. (3).... 1.677 -25. 



During the period of ten weeks Nos. i in D and D^ were fed 

 thirteen times (105 mg. average weight of piece), this amount 

 being as much as No. i in Set D would take. No. 2 of D was 

 fed 16 times; No. 2 of D^ 18 times; No. 2 of D' 16 times; No. 

 3 of D, D\ D\ 13 times. 



The result of the individual records were the same in general 

 as those for the entire sets. The irregularities of the percentage 

 increments in the two individuals of set D^ (Table XXII) may 

 be explained, or an explanation suggested. No. 3 was a large 

 female, the initial weight being 2.007 grs. The steady loss was 

 not due to a diseased state, but to the fact that the amount of 

 food was not sufficient to preserve the initial weight. This was 

 shown later when the experiment had closed; the animal was fed 

 as much as it w^ould take, and a steady gain followed. The high 

 percentage increment in No. 2, Set D\ may be due to the small 

 initial weight. 



Set E^ (Table XXIV) at 20° C. was fed as much and as often 

 as the individuals would take food, and Set E^ (Table XXV) 



