RESPONSES OF POIKILOTHERMS TO VARIATIONS 29 



surrounding water bath. The same has been found to be 

 true when salamanders and frogs are used. Thus it 

 appears that with precise temperature measurements, 

 little or no heat regulation obtains in the poikilotherm. 

 Hence the temperature of the poikilo-organism is appa- 

 rently determined through the gain and loss of heat 

 controlled by aforementioned extrinsic factors. 



