Chap. VII. 



SLEEP OF LEAVES. 



329 



more than 90°, so as to assume at night their vertical position. 

 On tho first day the leaflet simply moved up and down ; on the 



Fig. 131. 



BG<',oiid day it plainly circumnutated between 8 a.m. and 4.30 p.m. 

 after which hour the great evening fall commenced. 



