BARBERRY BUSH. 37 



naturally by the irritation produced by flies and other 

 insects coming to get the honey which is secreted by two 

 oblong glands, placed at the base of each of the threads, 

 or filaments of the stamen. Nearly the same fact is ex- 

 hibited by the common stinging-nettle ; and this last is 

 still more easily procured for trial. 



