CYRTANDRACES. 149 
Structure of the leaves of Aischynanthus, Figs 1, 2, 3, 4. 
Pl. CCCCXLI. 
Both cuticles are very thick, the upper one particu- 
larly and are beautifully transparent, composed of angular 
cells placed at right angles with the axis. These cells be- 
come rounder and much shorter towards the surface. 
The part of the leaf in which the green matter is de- 
posited is exceedingly narrow and very opaque. 
The primary vascular fascicle does not occupy the 
exact axis, but is nearest the inferior surface. 
The inferipr cuticle is composed of rounded and angular 
cells of large dimensions, both sections give at first the 
idea of pores existing in the surfaces of the cells. The 
cells contain a few green ovate or roundish corpuscles. 
The intercellular spaces are extremely distinct and vary 
much in shape and dimensions. On examining with high 
Powers the apparent pores, which are of large diame- 
ter and very distinct, one is induced to reject the idea 
of their being apertures. | 
lst. Because the appearance of a membrane covering 
them is sufficiently distinct, and like the remainder of the 
Wall of the cell examined, green corpuscles are frequently 
Seen adhering to them. 
2. Because on varying the light, they do not assume the 
exact colour of the field in which they are viewed, but 
have the Same appearance as the other cells. 
3. Because I have seen torn portions of membrane ad- 
hering to their edges some of which then had every ap- 
pearance of being open. 
4. Because on looking at the attachments of the cells 
one with another, we find them exactly of the same shape 
Clinta grandiflora, P. CCOCXL. Fig. VIL. 
Platystemma violoides, P. OOCOXL. Fig. VII. 
Stauragyne argentia, Pl, CCCCXL. Fig. I 
Aikinia brunonis, Pl. CCOOXL, Fig. IL 
