Anatomy of the Vine. 



13 



The part between the joints of the vine, as well as of other 

 plants, is called the collet by the French writers, and that 

 name I shall use for it. In Jig. I. the joints are opposite 

 to d e f g h, and the collets lie between them, as from d 

 to e, and from e to J, &c. On cutting one through, of half 

 an inch thick, with a sharp knife, the separated ends will 

 exhibit, with the assistance of a magnifying glass, a beau- 

 tiful organised substance, but all the parts so blended together, 

 that no distinction can be discovered between the bark and the 

 wood. But to enable them to iDe more clearly distinguish- 

 ed from each other, chemical aid must be resorted to. As 

 few practical gardeners <t 



are chemists, it will 

 be requisite to explain 

 to them upon what 

 principle the following 

 changes or precipitates 

 take place, as they will 

 frequently occur during 

 the discussion of this 

 subject. To facilitate 

 that knowledge, I re- 

 commend their procur- 

 ing three small flat-bot- 

 tomed glass bottles ; one 

 to contain a solution of " 

 the prussiate of potash*, 

 being a salt composed 

 of prussic acid and pot- 

 ash ; the second a de- /■ 

 coction of oak galls, or 

 of the teas from China, 

 being vegetable produc- 

 tions, containing gallic 

 acid combined with 

 other substances ; and 

 the third a solution of 

 the sulphate of iron, a 

 salt composed of sul- 

 phuric acid and iron. 

 Then place a little of 

 the solution of the prus- 

 siate of potash, by means 

 of a brush (fastened to 



* Throughout I shall apply those names for the tests, by which they are 

 most commonly known. 



