304 BRITISH FLOWERING PLANTS chap. 



foot-stalk. In reality they are folded back on them- 

 selves, and what seems to be the lower is really part 

 of the upper surface, so that the true lower surface 

 is very small and not visible in the usual positions of 

 the leaf (Figs. 192-194). In the thickness of the leaf 

 are from 5 to 13, generally about 10 chambers, which 

 have irregularly undulating outUnes. The interior of the 



Fig. 194. — Longitudinal section through a leaf of Lathrea. x 60. 



cavities bears two forms of glands (Fig. 195). The first 

 are in the form of a little head, consisting of two cells 

 on a short stalk. In the other the cells of the head form a 

 flattened dome. Both kinds of cells emit delicate proto- 

 plasmic filaments exactly like those of Ehizopoda (Fig. 

 196). When any small animals penetrate into the 

 chambers the projecting cells begin to emit filaments 

 which entangle and capture them, and by degrees suck 

 out all that can be digested, leaving only the claws, 

 hairs, and other hard parts. Several naturalists have 



