550 



LIFE MOVEMENTS IN PLANTS 



photographs of the day and night positions of the flower. 

 The closure and opening movements of this flower have 



Fig. 195. — Nympham closed at daytime. 



Fig. l!t(). — Ni/mphtm o\)0\\ at tii?hr. 



been regarded as being mainly due to recui-rent vari- 

 ations of light and darkness.* If the opening be due to 

 darkness, closure of the flower should take place in the 

 * Pfeffer— /6trf. Vol. Ill, p. 122. 



J 



