IG VEGETABLE ORGANOGRAPHY. 



tliem as a particular class of cellules, observes that they 

 are remarkably smaller than all the others. 



All these cellules, elongated either in length or 

 breadth, seem less adapted than the round for the 

 elaboration of the sap, but appear to assist perhaps in 

 its progress ; this is, at least, what may be concluded 

 from their habitual presence in the organs where the 

 fluids are in motion, and, at least as regards the Little 

 Tubes (tuhilles), from the fact that they compose the 

 largest part of the organs where the motion of the juices 

 appears to be performed. 



Section III. 



Of the Suhstances contained within the Cellules, and of 

 the Appearance of their Walls. 



The Cellules, examined in different plants, or at dif- 

 ferent periods of their growth, are sometimes full of 

 a watery juice, and sometimes of air: in neither of 

 these cases is their transparency affected ; and the 

 liistory of these substances contained in the cellules, 

 most important in Physiology, has not been confounded 

 by anatomical errors. But it is necessary to remark, 

 that besides these fluids, we meet with in these cellules 

 different opaque or coloured bodies, which deserve some 

 attention. 



1st. There are freqviently found little moveable granides, 

 opaque and colourless, which are of an amylaceous na- 

 ture, and bear the name of Fecula; these granules 

 are formed in considerable quantity in certain parts of 



