16 



Anatomy of the Vine. 



of the liber, and nearest to it, 

 is the sap wood or alburnum, 

 full of small holes; on the 

 margin of the pith, including a 

 little of the pointed parts of the 

 divisions of the alburnum, is 

 the medulla sheath ; and, in the 

 centre of the whole, is the pith 

 or medulla. In my future de- 

 scription I shall use the word 

 alburnum for the sap wood, me- 

 dulla for the pith, and cuticle 

 for the outward covering of the 

 whole. 



Fig. 4. is supposed to repre- 

 sent a horizontal view of two 

 entire divisions, with the pre- 

 cipitate upon them, instead of 

 one, for the sake of exhibiting 

 the cellular or divergent ray 

 between them. It is drawn 

 upon a large scale, that the 

 larger vessels, which compose 

 a division, may be the more 

 conspicuously seen. 



a a, Cuticle 



b b y Cellular texture 



c c, Vascular texture . - 



d d d, Fleshy vessels - - "j 

 e e, Ligneous vessels - 

 ff, Cellular or divergent rays of [ 

 the bark - - J 



g g, Concentric layer 



h h r Ascending sap-vessels 



i i, Cellular rays 



Jc, Horizontal vessels 



/, Primitive concentric 



wherein are 

 m m, The spiral vessels 



n. Medulla. 



1 



layer, 



I 



These form the 

 Liber from 

 p to q. 



These form the 

 Alburnum 

 from q to r. 



These form the 

 Medullary 

 Sheath from r 

 to s. 



These together 

 are commonly 

 called the Bark. 



These together 

 are commonly 

 called the Al- 

 burnum or Sap 

 Wood. 



Fearful that Jig. I. may not have been sufficiently explan- 

 atory to a beginner, I beg to recommend his dissecting a collet 

 himself, of 4 in. long ; but, previously, let it lie 48 hours in 

 water. Then, with the assistance of a moderate magnifying 



