WALTER E. GARREY 



47 



If we now compare the results obtained on the whole heart with 

 those obtained when the ganglion alone is subjected to changes of 

 temperature we are struck with the fact that there is not a single 

 feature of the temperature coefficients which will serve to differen- 



FiG. 1. Curves for the rates plotted against temperature. Data from Tables 

 III and IV. A, o, X, and n correspond to 1, 5, 2, and 4 respectively and show 

 the effects of progressive cooling; a, •, and ■ correspond to 8, 7, and 6 

 respectively. 



tiate one from the other. The magnitude of the temperature coef- 

 ficient and its variations are parallel in the two cases and we are justi- 

 fied in concluding that there is the same typical temperature coefficient 

 for the rate of the heart beat of Limulus when the ganglion alone is 



