14 Ada Springer 



period of seven weeks between March 12 and April 16 was 24° C, 

 the lowest 19° C. One set was fed three times a week, the other 

 starved. 



Two sets were kept at a temperature lower than that of the 

 room, viz: 11° C. on the average. The highest temperature 

 recorded was 15° C, the lowest 6° C, One set was fed three 

 times a week, the other starved. 



Two sets were kept at a temperature of 28° C. on the average. 

 The highest temperature recorded was 31°, the lowest 25.5° C. 

 As before, one set was fed and the other starved. 



The quantity of beef given to each individual averaged some- 

 what lower than 153 mg. per week, the variation being from one- 

 half to two-thirds of that amount. This was due to the fact that 

 the individuals under conditions of low temperature proved diffi- 

 cult to feed, and in almost all cases it was found necessary to 

 put the food into the mouth. This quantity was necessarily 

 taken as a basis for the other sets. 



A comparison of the records in Table XVI shows that the 

 relative rate of growth cannot be determined, because the quantity 

 of beef taken by the individuals in Set C, Table XVI (those under 

 conditions of low temperature), was only enough to preserve the 

 equilibrium. There were fluctuations between gain and loss, 

 but the results after seven weeks' time show there was a gain of 

 only 1.04 per cent of the original weight. 



The same amount of food was inadequate in the case of A and 

 B to preserve the equilibrium, and a steady loss was the result. 

 The percentage of loss was greater in Set A, where the temperature 

 was higher than in Set B; in the one case 31 per cent, and in the 

 other 23.08 per cent. 



On the other hand, the relative rate of loss can be determined 

 in starving individuals. This is found to be highest at a high 

 temperature (Table XVI), Set D, 58.5 per cent; it becomes lower 

 at the normal temperature, Set E 41.4 per cent; and lowest when 

 the temperature is below normal. Set F, 18.3 per cent. 



Records were kept of individual salamanders which had been 

 subjected to these conditions of temperature. Previous to the 

 experiment the animals had been fed three times per week since 



