526 STIMULI APPLIED TO LEAFLETS OF SCHRANKIA 



SUMMARY AND CONCLUSIONS. 



1. The pinnct of sensitive brier or Schrankia are favorable for 

 demonstrating summation of dissimilar stimuli. 



2. The demonstration was made as follows: A time of day was 

 chosen when the closure of a single proximal leaflet did not provoke 

 closure of the next distal leaflet. An irritating gas was applied to the 

 pinna. A few seconds later, a single leaflet was touched; it closed, 

 induced closure of the next distal leaflet, and inaugurated a wave of 

 closure which proceeded until all leaflets on the same side of the 

 mid-rib were closed. 



