A 



JOURNAL 



OF 



NATURAL PHILOSOPHY, CHEMISTRY, 



4nd 



THE ARTS. 



DECEMBER, 1309. 



ARTICLE I. 



On Vegetable Astringents. By John Bdsf ock, M. Di 

 Communicated by the Author. 



f Continued from page 22 2. J 



X~\MONG the constituents of galls We always find fnnci- Mucilage, 

 lage enumerated, and Mr; Davy gives a process for obtain- 

 ing it in a separate state, but I confess, that I am not alto- 

 gether satisfied with the force of the arguments, by which 

 its existence is thought to be proved. Mr* Deyeux, who I 

 believe first distinctly mentioned the existence of mucilage 

 in galls, founded his opinion upon an erroneous supposi- 

 tion, that no substance except mucus is capable of pro- not the only 

 ducing mould. The moulding, as has been shown above, ^^mouldy* 

 evidently depends upon the other constituents Of the infu- 

 sion*. With respect to the tests for mucilages, the only Tests not ap- 

 one which can be considered as applying generally to them, P licable here - 



* As a farther proof of this position I may remark, that I have ob- 

 served the process of moulding in Mr. Hatchett's artificial tan. 



Vol. XXIV. No. 109— Dec. I8O9. R and 



