Cuar. I. STRUCTURE OF THE LEAVES. 3 
excellently adapted for the special purpose of catch- 
ing insects, so that the subject seemed well worthy of 
investigation. 
The results have proved highly remarkable; the 
more important ones being-—firstly, the extraordinary 
fe 
1, Lbatvaamet bs 
Fie. 1.* 
(Drosera rotundifolia.) 
Leaf viewed from above; enlarged four times. 
sensitiveness of the glands to slight pressure and to 
minute doses of certain nitrogenous fluids, as shown 
by the movements of the so-called hairs or tentacles; 
* The drawings of Drosera and __ eularia, by my son Francis. They 
Dioueoa. given in this work, were have been excelleutly reproduced 
made for me by my son George on wood by Mr. Cooper, 188 
Darwin; these of Aldrovanda,and Stra. d. 
of the scveral speci‘s of Utri- 
