433 
Insectivorous Plants ( Part II). 
surface and elongation of the pitcher, being least in N. ampul- 
laria and largest in N. Edwardsiana , where they may be 
| inch in length and rV ~ 2V inch in width. But in the group 
of forms represented by N. gracilis , N. zeylanica (Plate XX, 
Fig. 26), &c., with narrow incurved collar, they are very small, 
and in N. laevis they are only A ~ tu of an inch long. 
Beside descriptions given in Professor Dickson’s communi- 
cation, I may add the following which I have since gathered. 
Those of N. echinostoma are inserted in a depression at the 
extremity of each isolated tooth of the collar and are oval in 
shape (Plate XX, Fig. 24). In N. Lowii their position is 
beautifully indicated in the plate that accompanies Sir Joseph 
Hooker’s description of the species 1 . Round the simple 
margin minute apertures appear in the middle of little 
papillae ; each leads into a cavity, the gland of which is 
elliptic and blunt at the extremity. 
The position and relation of each gland to the surrounding 
tissue is illustrated in longitudinal view in Fig. 22 of Plate XX, 
and a transverse section in Fig. 23. In the latter the presence 
of two layers of clear oval or almost circular cells immediately 
outside the gland-tissue proper and internal to the circle of 
bundles can readily be demonstrated, and traces of them can 
be followed with some difficulty in longitudinal view as elon- 
gated spindle-shaped cells. These correspond to the similarly 
related cells of the alluring glands already referred to, and 
those of the peptic glands next to be studied. 
A comparative view of four glands drawn to scale from 
widely distinct species is shown in Figs. 25-28, while their 
position and appearance in a seedling pitcher from the seventh 
leaf above the cotyledons is illustrated in Fig. 29. One sel- 
dom sees a copious secretion from these, but the difficulty of 
throwing full light on the shaded cavities may explain this. 
That the secretion is intensely liked by ants and cockroaches 
I have proved by repeated observations. 
Digestive glands. These, supposed hitherto to be associated 
with the secretion of a digestive substance, are arranged over 
1 Trans. Linn. Soc., Vol. xxii. 
