COMPARATIVE ELECTRO-PHYSIOLOGY 



inertia of the motile leaflets or of the galvanometer needle. 

 By the employment of the rheotomic method, however, I was 

 able to detect multiple responses having periodicities of the 

 order of one-tenth or so of a second. All the experiments 

 carried out on Amaranth gave two or three waves of electro- 

 motive variation, the character of which will be understood 

 from the following table and curve (fig. 40). 



It will here be seen that even after so short an interval as 

 oi of a second, a considerable electromotive change had 



FIG. 40. Response Curve from Rheotomic Observation in Stem of 

 Amaranth under strong stimulation 



Note occurrence of multiple response. Large division of abscissa = ! second. 



already been induced. The first maximum occurred after 

 15, the second after '3, and the third after '6 of a second. 



