280 Researches into the Anatomy of Plants. 
the seed, and of several other parts. I have proved that 
these small bodies are generally grains of starch, and some- 
times of mucilage; that we may dissolve them in hot water, 
and sometimes in cold water; while, on the contrary, the 
membrane resists all these solvents. It is clear therefore 
that these small grains are not small cellules. But it is 
very possible that they may be dissolved in the sap, and 
then form this viscous fluid, which gives birth to new 
cellules. 
The cellule seems to be an organ completely closed, so 
that the sap, which undoubtedly passes by the cellular 
texture, only penetrates it by imperceptible pores. There 
are cases in which we distinctly see the juice pass by pores 
of this kind. If we press, however gently, the calyx of the 
lettuce, there issues a small drop of a milky liquor by the 
epidermis, where we never see any pores with the best 
microscopes. M. Mirbel, however, found pores surrounded 
by a small ring in the partitions of the cellules. As all the 
observations of this excellent naturalist are so precise, I 
hesitate on this subject in forming my own opinion. I 
certainly saw small points raised on the membrane ; I saw 
in the midst of these points a clear and transparent spot 5 
and frequently I thought I had met with a true pore: but 
still I had my difficulties. These small points were some- 
times so heaped upon each other, that it occurred to me they 
must be small grains fixed on the membrane, and trans- 
parent in the middle. This is my opinion: it is for others 
to decide. 
There are several varieties of cellular texture, which may 
be distinguished in the following manner: 
1. Alveolary Texture. It consists. of short cylindrical 
or prismatic cellules: it is very common, particularly in 
the pith, external bark, &c. See Pl. T. fig. 3, 4, 5. 
2. Elongated Texture. It differs from the foregoing: 
the cellules are longer and narrower. We find them in the 
stamina, the pistils, and in some other elongated parts. 
See Pl. I. fig. 7. the elongated cellules are here taken from 
the pistil of the andirrhinum majus. 
3. Globular Texture. \t is composed of spherical or 
almost spherical cellules: it fills the interior of the leaves, 
of the peduncles, of the receptacle, &c. See Pl. I. fig. 8. 
a is a section transverse and perpendicular to the surfaces 
of a leaf of the dantana aculeata. 
4. Vesicular Texture. 11 is composed like the foregoing 
of spherical cellules ; but these cellules are more sain 8 
rom 
