Comparative Analysis of the Gum Resins. 341 
of the weight of eight grammes, the incineration of which 
left five decigrammes of ashes, which produced,—two centi- 
grammes of potash partly sulphated, four centigrammes of 
phosphate of lime, six centigrammes of carbonate of lime, 
and three decigrammes of quartzy sand, containing a little 
charcoal and some traces of oxide of iron. Lime and the 
alkalis did not discover any ammonia in the liquid products 
of this distillation. 
§ III. Twenty grammes of camboge were treated with 
warm alcohol and filtered. There remained on the filter.a 
substance which when well washed with alcohol was a 
grayish colour, drying with difficulty, and becoming brittle. 
In this state it weighed exactly tour grammes: it had an al- 
most insipid taste, and was entirely dissolved in water, with 
the exception of one decigramme of impurities. This solution 
reddened turnsole: when evaporated to dryness, it left a 
transparent friable residue similar to the coloured gum of 
the plum-tree, which like the Jatter burns with little flame, 
and leaves a good deal of compact charcoal, in which we 
find phosphate of lime. 
The alcoholic solution was of a red colour; when eva- 
porated to dryness it yielded a resin weighing 16 grammes. 
This resin is transparent, of a red colour, without any 
marked taste, and having a distinct idio-electrical virtue 5 
when pulverized it gives ont a particular smell, and assumes 
a bright yellow colour. 
If into the saturated solution of this resin in alcobol 
we pour some water, a little heat is produced, and a yel- 
Jowish milky liquor is formed; whereas most of the other 
resins precipitated from alcohol by water terminate by 
becoming partly grumous : it is on account of this easy di- 
vision of the resin of camboge that it is employed so much 
in miniature-paintings, &c, 
§1V. The solution of potash acts upon the resin of 
camboge with great promptitude, particularly when it’ is 
warm: there results an oily-like liquor of a deep red, in 
which the properties of potash are newtralizeds on evapo- 
rating this combination almast to qdryness, it erystallizes 
like the solutions af alaes. y j 
The soap of camboge resin is of a deep red colour, and 
almost black; it is soft to the touch, becomes friable when 
dried, and resembles a resin. 
It has the taste of rancid grease, and leaves a slight degree 
of acrimony op the tongue. It is easily dissolved in water 
without disturbing it. 
The acids imake so abundant a deposit in the soapy 
Y3 solution 
