LECT. III.] VASCULAR TEXTURE. 75 



with different juices according to the nature of 

 the roots and the fruit. 



When the cellular texture is compressed, the 

 cells are found forming nearly parallelograms, as 

 in the leaf-stalk of the Artichoke, in which they 

 have a somewhat tubular appearance ; and, by the 

 stretching of the membrane, the pores, which in 

 the hexagonal cells are arranged without any 

 order, are now very regularly disposed. The cells 

 are proportionally more abundant in herbaceous 

 plants than in trees ; and in the younger than in 

 the older branches. Senebier asserts that the par- 

 titions of the cells consist of a double membrane ; 

 but this is not capable of demonstration. 



Such is the nature and appearance of the cel- 

 lular texture. There is every reason for believing 

 that it enters as a component into almost every 

 part of the vegetable structure ; and anatomy con- 

 firms the opinion as far as we have the means of 

 ascertaining the fact. There are indeed some 

 plants, as the Fuci and other marine vegetables, 

 which appear to be altogether composed of cel- 

 lular texture. 



The next of the solids enumerated is the 

 Vascular texture. It consists of hollow tubes 

 of different forms and structure, which are 

 capable, like the vessels of the animal frame, 

 of conveying fluids. When a succulent stem 

 is cut transversely, fluids are seen issuing from 



