Anatomy of the Vine. 



some of them consist entirely of cellular vessels. In the vine 

 their outward appearances are so different in some parts, that 

 I am induced to separate them into two divisions, to facilitate 

 their description ; such as those of the medulla I shall call 

 extended eellidar vessels, and such as unite the divisions of 

 the collets the close cellular vessels. The first are generally 

 soft and perishable ; the latter are as durable as the woody 

 divisions which they unite in the vine, oak, &c. 



I beg to refer youto./g. 48. ; the whole of the vessels there 

 represented at a b c d e fare extended cellular; such ves- 



sels surround the bundles of vascular texture atyj in Jig. 51., 

 and they also join the cuticle ; they are hexagonally shaped, 

 like the cells of the honey-bee. The same vessels also extend 

 between the divisions of the liber, and between those of the 

 alburnum, as inyfg. 51. at x, y\ but in the latter situation they 

 lose the extended hexagonal shape and become flattened, 

 and appear as close cellular vessels ; round the points of the 

 divisions, which extend into the medulla, they become again 

 the extended cellular vessels. It is not only the change of 

 the outward appearances of these vessels, which is extraordi- 

 nary, but that they should also contain certain different fluids. 

 To prove which, apply to the surface of a horizontal slice of a 

 collet the spirituous tincture of iodine : after it has remained 

 there a little time, the close cellular vessels between the albur- 

 num and round the points of the divisions, with some part of 

 the medulla, will show a black precipitate ; this is the iodate 



s 2 



