310 VEGETABLE ORGANOGRAPHY. 



pores or Stomata, which appear to be evaporating 

 organs (Book i. Ch. 2, 3, 5, G). 



5th. The cellules are endowed with the faculty of 

 uniting together, of absorbing the moisture around 

 them, and probably of contracting and dilating. They 

 are round, or more or less elongated ; the former 

 inclose the feculent, mucilaginous, or resinous matters 

 which they have elaborated, of which the latter contain 

 little or none. The round ones form the parenchyma ; 

 the long ones (by themselves in cellular plants, united 

 with the vessels in vascular ones) compose the fibres or 

 nerves (Book i. Ch. ti, 4). 



6th. The passages between the elongated cellules, or 

 the vessels, appear eminently to serve for carrying the 

 lymph, i. e. the as yet unelaborated watery juices. 

 Those which are formed among the round cellules con- 

 tain the more stagnant juices (Book i. Ch. 2). 



7th. The vessels, whatever their form, seem eminently 

 intended to contain air or gas, and are true aerial canals, 

 at least in the ordinary course of vegetation (Book i. 

 Ch. 3). 



8th. Certain particular points of the surface of plants, 

 and especially of vascular ones, are more eminently 

 endowed with the faculty of absorbing water. They are 

 called Spongioles, and arc situated at the extremity of 

 roots, at the top of the style, and on the surface of seeds 

 (Book i. Ch. 7). 



9th. Dilatations of the intercellular passages, or, in 

 certain cases, ruptures of the cellules, cause irregular 

 cavities in the interior of the tissue. These receive the 

 name of Air-cavities when filled with air, or of Re- 

 ceptacles of proper Juice when they contain an 

 elaborated juice (Book i. Ch. 11, 12). 



10th. Glands or glandular surfaces are some of them 

 composed only of cellular tissue, others of cellular tissue 



