1 34 Anatomy of the Vine. 



ginal band, although the character of the vessels is tolerably 

 correct ; for they are so extremely small, and so closely con- 

 nected together, that the figure may be considered more to 

 show their relative situation than for any other purpose. 



The vessels of the claws, with the base and stalk of the 

 leaf, may be dissected in two ways. The first, by filling the 

 spiral and ascending sap vessels with the precipitate of the 

 prussiate of iron, as I mentioned before, which will discover 

 them when the cuticle and cellular texture are removed, by the 

 black shade through their vascular texture and liber. The 

 second, without making any such preparation, but removing 

 directly the cuticle, the cellular and vascular texture, and also 

 the liber ; when the spiral and ascending sap vessels will be 

 readily discovered, by their delicate silver-like appearance. 

 On reaching the separated bands of the stalk of the leaf, it 

 would be better to leave them entire, and to remove only a 

 little of the cellular texture from between them. 



For the present, I shall defer exhibiting the continuation of 

 these vessels from the stalk into the leaf, until I have described 

 those of the vascular and cellular texture, and also the spiral 

 vessels, because an explanation of them will facilitate my com- 

 munication upon the subject of the leaf. But I beg to premise 

 that whatever I may advance respecting them will be very 

 short of the clear and voluminous description given of the 

 various vessels of leaves, by Dr. Thomson, in his Lectures on 

 the Elements of Botany; which volume should be in the hands 

 of every person, not only the anatomist but the botanist, as it 

 is superior, in my opinion, to any ever published : and I have 

 to lament, with many others, that this gentleman has not fa- 

 voured the world with the second volume, to complete such a 

 very valuable work. 



The vascular texture has not been so much noticed by the 

 anatomists of vegetation as I think it deserves ; but this observ- 

 ation may arise from my great partiality for these vessels : 

 for they have been a beacon to me in my researches, by the 

 prominence of their large bundles, which have directed me to 

 a very interesting object, and removed very conflicting cir- 

 cumstances, as the following description will show. These 

 bundles distinctly exhibit the outside of every division of the 

 collet, as well as every band in the stalk of the leaf, when 

 the cuticle and cellular texture are removed. Fig. 23. repre- 

 sents 24 of them, though reckoned across both at the top 

 and at the bottom, although three divisions have been taken 

 from them to form part of a leaf. I hope it has been clearly 

 proved that 6 divisions out of the 48 are appropriated to 



