FOLIAGE LEAVES: THE LIGHT-RELATION. 



11 



Fig. 4. Two sensitive plants, showing the motile leaves. The plant to the left has its 

 leaves and numerous leaflets expanded ; the one to the right shows the leaflets 

 folded together and the leaves drooping. — After Kekner. 



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

 apex of the leaf points in a general north or south direction. 

 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 



of too intense light. It 



to do with avoiding the danger 



