Comparative Analysis of the Gum Resins. 343 
The acid liquor and the washings were thickened in or- 
der to drive off what remained of the nitrie acid, and this 
residue was diluted with water in which had been dissolved 
a small quantity of potash, which separated four deci- 
grammes of the yellow resiniform substance. The liquor 
when again thickened, and then. treated with alcohol and 
filtered, left some very white acidulous oxalate of potash, 
which when dried weighed one gramme. The alcoholic 
solution furnished on evaporation, three grammes of bitter 
matter soluble in water, and which contained malic acid. 
' § VI. I diluted some camboge in fine powder in a-cer- 
tain quantity of water, and passed through it a stream of 
oxygzenrted muriatic gas, with the intention of taking away 
tLe colour of this resin, which in fact lost its fine yellow 
colour > the milky liquer, wheu thickened, afterwards di- 
luted in-water-and filtered, left on the filter a substance 
which was washed, with, boiling water until the latter did 
not reddenpturnsole tingsures «Che following were the pro- 
perties whieh this substance presented :— 
It is pulverulent, of a pale yellow, colour without any 
sensible taste: itoerackles, under the teeth lke an insoluble 
salt, nor| does bailing/ water dissolve it. yj eis very little fu- 
sible, and, does, not giye out anyosmell, while, it 1s not de- 
composed 5 but when, we set fire to it,,or when we spread 
it on burning coals, it.exhales pungent wapours,of muriatic 
acid. ; AO err to vol 1 4Sq@59H Shes 
_ The weakened acidsgive, out; nothing, perceptible from 
it; but if they are concentrated, therej$;/a production of 
charcoal and muriatigragidaid: 548 9} noan tw 
When joined, with potash this. substange, yields a com- 
pound of an agreeablessmell,of, snaps,instbe solution of 
which the nitrate of sjlveriforms a precipitate,partly soluble 
in the nitric acid. resi enonuloe Jaotsc: 
J distilled six grammessof,thisisnbstance in a) small re- 
tort whieh I made redi;hots ;the -produce, was ¢gilected in 
some decigrammes of} water,: which whenjexamined, at the 
termination of the distillation: was; strongly acidj,and had 
the smell of muriatic acid: L poured into.this water sone 
nitrate of silver, which produced an alyndayt, precipitate 
of muriate of silver. When well dried and washed, this 
precipitate weighed five grammes four decigiammes, which 
contain 1 gramme 35 centigrammes of muriatic acid, sup- 
posing, according to Bergman, that.100 parts of muriate of 
silver are formed of 25 muriatic acid. and 75 oxide. 
There remained in the retort two grammes one deci- 
grammevof lieht charcoal. 
, Y4 It 
