MOVEMENT OF NYMPHAEA 



219 



But there are definite facts which do not by any means 

 support this conclusion ; for if the movements of the petals 



Fig. 126, Nymphaea closed in daytime. 



Fig. 127. Nymphaea open at night. 



were entirely dependent on light, two opposite effects 

 would be produced in the morning and evening respectively. 

 But the Water-Lily is open at both these times. Moreover, 



