320 



MODIFIED CIRCUMXUTATION. 



CHAP. VII. 



sleeping is common to some few plants throughout 

 the whole vascular series. The greater number of the 

 genera in the list have been observed by ourselves 

 with more or less care ; but several are given on the 

 authority of others (whose names are appended in the 

 list), and about these we have nothing more to say. 

 No doubt the list is very imperfect, and several genera 

 might have been added from the l Somnus Plantarum' 

 by Linnaeus ; but we could not judge, in some of his 

 cases, whether the blades occupied at night a nearly 

 vertical position. He refers to some plants as sleeping, 

 for instance, Latliyrus odoratus and Vicia faba, in which 

 we could observe no movement deserving to be called 

 sleep, and as no one can doubt the accuracy of LinnseuSj 

 we are left in doubt. 



List of Genera, including species the leaves of winch sleep. 



