Osap. XL STRUCTURE OF THE LEAVES. 287 
The two lobes stand at rather less than a right angle 
to each other. Three minute pointed processes or 
filaments, placed triangularly, project from the upper 
surfaces of both; but I have seen two leaves with four 
filaments on each side, and another with only two. 
These filaments are remarkable from their extreme 
sensitiveness to a touch, as shown not by their own 
movement, but by that of the lobes. The margins of 
the leaf are prolonged into sharp rigid projections 
which I will call spikes, into each of which a bundle 
Fig. 12. 
(Dionea muscipula.’ 
Leaf viewed laterally in its expandn state. 
of spiral vessels enters. The spikes stand in such 
a position that, when the lobes close, they inter-lock 
like the teeth of a rat-trap. he midrib of the 
leaf, on the lower side, is strongly developed and 
prominent. 
The upper surface of the leaf is thickly covered, 
excepting towards the margins, with minute glands of 
a reddish or purplish colour, the rest of the leaf being 
green. There are no glands on the spikes, or on the 
foliaceous footstalk. The glands are formed of from 
