Anatomy of the Vine. 



265 



and to be in full vigour ; and that a thin horizontal slice taken 

 from one of its collets would be similar to fig. 51., and the seve- 

 ral vessels of it would be as in the following description of ves- 

 sels, C, ofy^. 51. 



[C] 

 - 1 



«, Medulla 



b, Spiral vessels 



c, Concentric layer 



d, Ascending sap-vessels 



e, Liber 



f, Bundles of vascular texture 



g, Cellular vessels and cuticle 



On the 7th of Au- 

 gust, 1829. — About this 

 time an alteration would 

 have taken place in the 

 vessels of the shoot of 

 fig. 50. ; its cuticle, cel- 

 lular and vascular tex- 

 ture, would have lost 

 their accustomed vi- 

 gour, and would be se- 

 parated from the liber, 

 leaving a space between 

 them, which would be 

 filled up immediately 

 with close cellular tex- 

 ture. Fig. 52. gives a 

 representation of such 

 changes, and of the ves- 

 sels in actual vigour, as 

 in the following descrip- 

 tion of vessels, D, of Jig. 27. 



[D.] 



a, Medulla - 



b, Spiral vessels - 



c, Concentric layer 



d, Ascending sap-vessels 



e, Liber - 



i, New close cellular vessels or covering 



f, Vascular texture 

 o, Cellular texture and cuticle 



These vessels of the divisions 

 were in full vigour on the 10th 

 of July, 1829. 



These vessels of the divisions 

 continued in full vigour on the 

 7th of August, 1829. 



the divisions 

 vigour about 



These vessels of 

 < ceased to be in 

 I 7th of August, 1829 



So that the vascular texture, the cellular texture, and the 

 cuticle ceased to contribute to the direct support of the vine 

 after the 7th of August, 1829, although they continued to cover 

 the remaining animated vessels of the bark. Infigs. 46, 47, 

 49. the liber has been represented gradually enlarging, con- 

 sisting of the two ligneous and the three fleshy bars. Although 



