52 



DYNAMICS OF NERVE CELLS. II 



the nerve cells that, after the temperature is again raised, the activi- 

 ties are pitched at a higher level than that maintained at this tem- 

 perature prior to cooling. But while this is usual it is not an invaria- 

 ble result of cooHng as is shown by the two experiments summarized 

 in D and E (Table I). 



o 



iO' 



15 



20' 



25' 



30' 



35 



Fig. 1. Curves of the relative velocities of CO2 production by Limulus heart 

 ganglion at different temperatures. The data from Experiments A, B, and E, 

 Table I. The reciprocal of time in seconds is multiphed by 1,500. 



