10 VEGETABLE ORGANOGRAPHY. 



CHAPTER II. 



OF CELLULAR TISSUE. 



Section I.— Of Cellular Tissue in general. 



The Cellular Tissue (contextus cellulosus), con- 

 sidered collectively, is a membranous tissue, composed 

 of a great number of cellules or cavities, closed on all 

 sides. The froth of beer, or a piece of honeycomb, gives 

 a rude but pretty accurate idea of it; each wall of water 

 or wax represents the membrane, and the place of the 

 air or the honey gives the idea of the cavity or cellules. 

 This tissue has also received the name of the Utricular 

 Tissue (complexus utricularis ) , which makes a more 

 particular allusion to the theory, in which we admit that 

 each cellule is a perfectly distinct vesicle. Link has 

 named it Tela Cellulosa, and others Complexus Cellulosus. 

 When considered collectively, and in contradistinction 

 to parts which are furnished with many vessels, the 

 name of Parenchyma has been given to it. 



The cavities of cellular tissue bear the name of Cel- 

 lules (cellules). Malpighi, who considered them as 

 so many distinct vesicles, calls them Utricles (utriculi). 

 Grew has indifferently described them under the names 

 of Cellules, Pores, and Vesicles. 



