FOLIAGE LEAVES : THE LIGHT-RELATIOX 



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

 le;i\es and numerous leaflets expanded ; the one to the right shows the leaflets 

 folded together and the lea\'e8 drooping. — After Kehnf:h. 



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

 ape-Y of tlie leaf points in a general north or south direction. 

 It is a significant fact thtit when the ^ilant grows in shaded 

 places the leaves do not assume any such position. It 

 seems evident, therefore, that the j)Osition has something 

 to do with avoiding the danger of too intense light. It 



