Chap. VII. FIEST-FOEMED LEAVES. 417 



the interesting fact of the pulvini or organs of move- 

 ment of these little leaflets, not having been reduced 

 nearly so much as their blades — taking the large 

 terminal leaflet as the standard of comparison — givee 

 us probably the proximate cause of their extrao: dinar j 

 power of gyration. 



