110 VEGETABLE ORGANOGRAPHY. 



are bundles of little parallel tubes, or very elongated 

 cellules, which contain a proper juice : it is in organs 

 of this kind that the proper juices of the Apocineae 

 are stored up ; the fibres of the bark of the Hemp are 

 only bundles of fasciculated reservoirs. 



5th. Accidental Receptacles (rSservoirs acci- 

 dentels). I have united under this name the cavities 

 which are found full of proper juice without any regu- 

 larity, and which become receptacles of proper juice 

 without their having been originally destined for this 

 purpose : it is thus that the proper juices often filter 

 into the lymphatic vessels of the Coniferas, into the 

 cellulles of the pith of certain Euphorbiaceae, &c. 



The details into which I have entered, prove what I 

 have before advanced — that the proper juices have not 

 in reality an organ specially destined to contain them ; 

 they are lodged in the cavities contiguous to them, which 

 are formed into kinds of sacs of a membranous or 

 fibrous appearance. Those who admit the existence of 

 intercellular passages, regard the receptacles of proper 

 juices as formed by the distension of these canals, and 

 the compression of the neighboui-ing cellules : those 

 who deny their existence are obliged to admit the 

 rupture and disorganization of the tissue, in order to 

 produce the formation of the cavity destined to contain 

 these juices. The first opinion is more easy to 

 comprehend in its anatomical relation; but, entirely 

 giving it the preference, I do not deny that it can 

 scarcely be understood in this theory, why, in a great 

 number of cases, the Receptacles are terminated so 

 cleanly. 



The Receptacles of Proper Juices, like the juices 

 themselves, are found in several families of Dicotyle- 

 dons, as the Guttiferas, Hypericineae, Chicoraceffi, 

 Euphorbiacefe, Myrtacefe, Apocinca?, Artocarpcae, 



