444 



FRANCIS M. BALDWIN. 



extent of the experiment by a small alcohol flame through con- 

 duction. It is noted that the body temperature lagged slightly 

 but kept pace with the environmental rise. At the end of two 

 and one half hours, the temperature had reached the critical 

 point and the animal was removed in a moribund condition 

 from which it did not recover. Several other experiments with 

 other individuals eventuated similarly. 



TABLE VI. 



Summary. i. The rectal fluctuations of the common painted 

 and snapping turtles of various sizes and weights are followed 

 through ranges of non-critical and critical high and low environ- 

 mental changes. In the non-critical range (50-80 F., 10-27 C.) 

 in both forms the fluctuations are found to vary from 3 to 6 

 degrees F. (1.5 to 3 C.). When the environmental drop is 

 rapid on cooling the rectal reading shows a somewhat greater 

 lag than when cooled more rapidly. In both procedures a 

 check in drop appears at about 40 degrees F., (4.5 C.) and there 

 is maintained for a considerable interval of time. 



2. Accompanying these temperature changes are noted differ- 

 ences in physiological activities, with muscular action at the 

 outset which merges into a period of comparative quiet, this in 

 turn followed by slow continuous movements. 



3. Increase in environmental temperature is accompanied by 

 a corresponding rise in body temperature and as a rule this is 

 fatal if maintained at 102 to 105 degrees F., for any considerable 



