Researches into the Anatomy of Plants. 281 
from each other, and frequently dispersed. This texture is 
common in mushrooms; and several kinds of agarict, 
pexize, and phallus, are entirely made up of vesicles. 
5. Irregular Texture. The sides do not form the same 
angle with the base: sometimes this angle is a straight an- 
gle, sometimes acute, sometimes obtuse. We find this 
texture in the sheaths of the leaves, in the bractez, the 
calyces, &c, particularly where one part is attached to the 
other. See in Pl. I. fig. 9, this texture taken from a 
bractea of the scirpus maritimus. 
6. Hazel-tree Texture. ‘The cellules are not spherical, 
cylindrical, or prismatic: they have rather an oval or oblong 
form. This texture is common in the internal bark of the 
hazel-tree, and particularly between the fibrous vessels be- 
side the trachese. PI. I. fig. 10. represents this texture in 
the inner bark of a root of the malva crispa. 
These six varieties of the cellular texture admit of several 
shades, and we frequently find intermediate forms which 
appear to be two varieties at once. We might add a se- 
venth variety, the compact texture, which 13 found in some 
mushrooms, lichens, &c.: but this texture is not clearly 
developed, or rather it is so fine that its structure cannot be 
distinguished. 
The arrangement of the cellules is generally alternate, 
such as we see in Pl. I. fig. 5, and these rows follow the 
length of the parts in which we find them. Sometimes 
these rows are laid transversely ; 1 found this arrangement 
in the leaves, when we cut them in a direction perpendi- 
cular to the surfaces; which is very difficult, particularly 
if the leaves are thin. But in the latter this arrangement 
is more distinct than in the thick leaves, where it is ge~ 
nerally wanting. See Pl. I. fig. 8. l. We find it already 
in the small leaf which is just coming out, These trans- 
verse rows are seen in the middle of the wood, (PI. I. 
fiz. 16. ¢.) [Plate V. of the present volume] as we shall 
presently see, aud at the surface of the roots, particularly 
if they are in considerable size. I have represented this 
arrangement as we see it at the surface of the thick roots 
of the malva crispa, Pl. I. fig. 11. We do not find it in the 
small roots, and I am certain that it is formed by the in- 
crement of the root, which extends the bark, and draws 
aside the meshes of the net-work of the cellules. Take a 
piece of common thread net, for instance, and draw it at 
both ends; you will see the meshes arrange themselyes in 
horizontal rows in a way similar to that which we have seen. 
The cellule increases with the whole plant. It is 
astonishing 
