CONSTANT CURRENTS AT VARYING TEMPERATURES 93 



In illustration the following table giving the averages of four experiments 

 with Nitella transhicens is appended ; the times of flow across a measured 



FIG. 10. Apparatus for showing conjoint thermal and electrical excitation. 



portion of the field being noted before and after the application of a con- 

 stant current lasting for five seconds. 



Above 40 C. the result produced differs according to the duration of 

 the previous exposure to the high temperature. It is worthy of note that 

 although the strength and duration of the current influence the length of 



