FOLIAGE LEAVES: THE LIGHT-RELATION 



11 



Fig. 4. Two t;ensitive plants, showiiiLC tlu' n 

 leaves and numerous leaflets expandt-d 

 folded together and the leaves drooping.- 



U'avcs. TIk' iilaut lo the left has its 

 the one to tiie right shows the leaflets 

 After Kerner. 



the morning and evening (see Fig. 170). As a result, the 

 plane of the leaf lies in a general north and south direc- 

 tion. It is a significant fact that when the plant grows in 

 shaded places the leaves do not assume any such position. 

 It seems evident, therefore, that the position has something 



It 



to do with avoiding the danger of too intense 



iight. 



