CHAF. I. 



STRUCTURE OF THE LEAVES. 



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 



FIG. 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 cularia, by my son Francis. They 



Diona-ft. given in this work, were have been excellently reproduced 



made for me by my son Georgo on wood by Mr. Cooper, 183 



1 >nrwin ; those of Aldrovanda, and Stria d. 

 of the several speci.'S of Utri- 



