LINK ON CELLULAR TISSUE. 215 



rounded by a little gland in the partitions of the cells. As the 

 observations of this naturalist are so exact, I am in doubt on this 

 subject. I have seen little points raised above the membrane : 

 I have seen a clear transparent spot in the middle of these points, 

 and have often believed I had found a real pore, but have always 

 resumed my own opinion. These little points were sometimes so 

 crowded on each other, that they may be taken for little grains fixed 

 on the membrane, and transparent in the middle. This is my opinion. 

 It is for others to decide on it. 



There are many varieties of the tissue of plants, which may be 

 distinguished in the following manner : 



1st. Honey-comb Tissue. It consists of short cylindrical or pris- 

 matic cells ; and is very common, especially in the pith, the exterior 

 bark, &c., as is represented in the figure. 



2d. Extended Tissue. This differs from the preceding, in the cells 

 being longer and narrower. They are found in the stamens, the 

 pistils, and in some other extended parts, as in the pistil of the Antir- 

 rhinum majus. 



3. Globular Tissue. It is composed of cells, either spherical or 

 nearly so, and fills up the interior of the leaves, of the flower stalks, 

 and of the receptacle, &c. 



4. Vesicular Tissue. Composed, like the preceding, of spherical 

 cells ; but these cells are more detached from each other, and are often 

 dispersed. This tissue is common in mushrooms, and several species 

 of Agarici, of Peziza, and of Phallus, are constituted entirely of 

 vesicles. 



5. Irregular Tissue. The partitions do not always form the same 

 angle with the base ; sometimes it is a right, sometimes an acute, and 

 sometimes an obtuse angle. This tissue is found in the sheath of the 



