68 
HISTOLOGY OF VEGETABLES. 
In certain Kuphorbiaceous 
nuts , the sclerogen is of a bril- 
liant crimson colour, and in the 
specimen, represented by Fig. 
53, the cells are of a peculiar 
shape, having indented or wavy 
margins, and when light is trans- 
mitted through such objects, the 
red colour is so bright as to in- 
terfere with distinct definition. 
Each cell is nearly filled with the crimson deposit. 
In the Walnut , Cocoa , and Hazel-nuts , the same kind 
of tissue is found ; in these, the pores with their central 
cavities, resemble in a most striking manner the cells of 
bone ; but, as I have so often stated, in vegetables 
the cell-wall always remains, forming a strong barrier 
between the ends of the pores or canaliculi of adjoining 
cells ; whereas in bone, the cell-wall disappears, and the 
canaliculi anastomose. 
In the specimen represented by Fig. 54, the cells 
FIG. 53 . 
Section of the testa of the seed 
of a Eu/phorhiaceous nut. 
fig. 54 . 
Transverse section of the shell of a 
Cocoa-nut. 
fig. 55 . 
'Vertical section of the shell of a 
Cocoa-nut . 
