FOLIAGE LEAVES: THE LIGHT-RELATION. 



11 



Fig. 4. Two seusiLive plants, ehowing the motile lein es. The plant to the left has its 

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

 folded together and the leaves drooping.— After Keknek, 



the morning and evening (see Fig. 105). 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 jjosition. It 

 seems evident, therefore, that the jiosition has something 

 to do with avoiding the dtiiiy-er of too intense light. It 



