438 



FRANCIS M. KAI.1AYIN. 



increase in the production of heat. The temperature correlations 

 from seven similar experiments are averaged and plotted against 

 the time intervals and are shown in Fig. 2. Although the body 

 temperature as a rule shows an immediate drop, it is not nearly 

 commensurate with the rapid decline of the surrounding water, 

 and it is conspicuous that during the succeeding four hours the 

 differences are considerable and on the average remain from 

 8 to 10 F. above that of the environment. 



40 



FIG. 3. Plot showing the average body temperature drop from five painted turtles, 

 correlated with a slow environmental drop. 



On the following and succeeding days, experiments with the 

 same and other individuals of about equal weight were performed 

 where the animals were subjected to slow cooling which extended 

 over a period of two hours and were then maintained at the 

 temperature of melting ice for another interval. Data from a 

 typical experiment on a painted turtle, are shown in Table III., 

 and the plot of the average fluctuations in temperatures from 

 five records is given in the plot of Fig. 3. 



From the table it is noted that at first the animals are quite 

 active but this activity gradually merges into a period of quies- 

 cence as the temperature drops to about 45 degrees where, due 

 probably to slight innvnse in activity, the drop is checked. 



In the case of the body temperature changes in the snapping 

 turtles less conspicuous differences are noted. They follow more 



