possessing the Properties of Tannin. 63 



Nitrate of lime rendered it turbid, and produced a slis^ht 

 precipitate. 



INIuriate of tin formed a copious yellow precipitate. 



Acetiie of lead produced k similar effect : 



And gelatine yielded a bright yellow deposit, which was 

 completely insoluble by boiling- water. 



H. Asa ftetida yielded a solution which also precipitated 

 gelatine like the substances above described. 



r. Solutions of elemi, tacamahac, olibanum, sandarach^ 

 copaiba, mastich, myrrh, gamboge, and caoutchouc, were 

 next examined ; but these, although they precipitated the 

 metallic solutions, did not affect gelatine. It is possible, 

 however, that they might have produced this eficct, had 

 they been subjected to a greater number of repetitions of 

 the process. 



K. Sarcocol, in its natural state, as well as the gum sepa- 

 rated from it by water, when treated with nitric acid, did not 

 precipitate gelatine ; but produced effects on the metallic so- 

 lutions similar to the above-mentioned substances. 



L. Gum arable afforded oxalic acid, but not any of the 

 tanning matter. 



M. Tragaeanth yielded an abundance of saclactic acid, of 

 oxalic, and of malic acid, but not the smallest vestige of the 

 artilicial tanning substance. 



N. Manna, when treated with nilric acid in the wav above 

 described, afforded oxalic acid, part of winch was sublimed 

 in the neck of the vessel. 



'1 he residuum with water formed a brown solution, which 

 yielded a pale yellow precipitate with sulphate of iron. 



Muriate of tin produced a |>ale brown precipitate. 



Acctite of lead formed one of a I^rownish-white hue. 



Lime was copiously precipitated from the nitrate of lime 

 in the state of oxalate; but not the smallest effect was pro- 

 duced on solution of isinglass. 



O. Liquorice however afforded a different result ; for al- 

 though the solution after the process with nitric acid rcbcm- 

 blcd in appearance that Vv hich was yielded by manna, yet the 

 effects were not the same. 



Sulphate 



