230 ANALYSIS or GAMBOGE. 



cid matter. The whole being diluted with a quantity of 

 water, a gediraent was formed, which, when well washed 

 and dried, weighed 1*3 gram, [20 grs], 

 FrodBcl. This matter is of a yellowish colour, and bitter taste. It 



is partly soluble in boiling water. On cooling the solution 

 grows turbid, and lets fall a portion. The iiltered solution 

 is of a reddish yellow, froths when shaken, reddens infusion 

 of litmus, is rendered of a deeper colour by the addition 

 of an alkali, and forms a slight precipitate alter some time 

 with sulphate of iron. 



On burniug coals this substance does not melt so easily 

 as the resin, diffuses a fragrant smell, and leaves a great 

 deal of coal. 



It combines very well with potash and spirit of wine, 

 forming with them transparent red solutions. 



Nitric acid, heated gently with it, dissolve it, without 

 occasioning any sensible alteration. Water produces a co- 

 pious white coagulum in the solution. 

 A resinoamer. From these properties I think I may fairly consider this 

 substance as a particular species of soluble factitious resino- 

 amer, combined with a yellowish resiniform substance in- 

 soluble in water. 

 ProdHceofth* The acid liquor and waters of elutriation were boiled 

 nioiierwa ^'^'•^^^j,^ ^^^ drive off any nitric acid that might rettiain; and 

 the residuum was diluted with water, in which a small 

 quantity of potash was dissolved, which separated 4 dec. 

 [6 grss] of the yellow resiniform substance. The liquor 

 being again boiled down, then treated with alcohol, and 

 filtered, left 1 gram. [15*4 gr.*-] of very white superoxalate 

 of potash. The alcoholic solution produced on evaporation 

 3 gram. [46'3 grs] of bitter matter, soluble in water, and 

 containing malic acid. 

 Th? resin act- SecL V. I diluted some of the realn of gamboge in fine 

 ed on by «xi- pQ^^jgP ^j^j^ water; and passed into it a stream of oximu- 

 muriaticgas. . . . , • m .i i ^ • r . 



rittic acid gas, to try its enect on the colour; and in tact 



it destroyed its fine yellow. The milky liquor being boiled 

 down, then diluted with water, and filtered, left on the 

 filter a substance, which was washed with boiling water, 

 till what came off would no longer redden litmus. The fol- 

 lowing were its propprties. 



It 



