SECT. II. THE PULP. 321 



surely the setting up of a distinction without any 

 very essential difference ; for the structure is the 

 same in both. And if the juice is in the one case 

 resinous and in the other watery, may it not be ac- 

 counted for like the colour, from the circumstance of 

 accidental situation ? But the character of the want 

 of colour, on which great stress appears to have 

 been laid, is in effect entirely done away as aground 

 of distinction ; because the juice of the paren- 

 chyma is, as it seems, often coloured also like that 

 of the herbaceous tissue itself, at least in the more 

 tender parts of the plant. The distinction is there- 

 fore altogether destitute of utility. And if it is 

 recollected that M. Mirbel employs the term paren- 

 chyma to denote also the pulp, or according to his 

 own appellation the cellular tissue of the leaf, which 

 is both colourless and resinous, it will appear to be 

 besides destitute of propriety. 



But in the description of the vegetable pulp, the Though 

 only distinction necessary to be made is that by ^[3 are 

 which it is divided into two parts namely an ap- mereI 7 an 



* apparatus 



paratus of hexagonal cells or .esicles, and a con- of vesicles 



... , . and a con- 



tained juice whether colourless or coloured the tained 



union of which substances forms a true pulp. But Jul 

 as the cells may still remain, though emptied of 

 their original juice, and constituting no longer a 

 pulp, it seems necessary to precision both of idea 

 and language, to designate each of the component 

 parts of the pulp by an appropriate term, as we 

 shall thus avoid the inconsistency by which the 



VOL. I, Y 



, OF THE 



TY ) 



. / 



