$58 = Compurative Analysis.of the Gum Resins. 
the weak nitric acid 1.5, decigramme of phosphate of lime, 
which was separated from it by ammonia, in addition to 
3 decigrammes of carbonated lime, separated by the sub- 
carbonate of potash. ' 
§ HII. A. 1 boiled 25.grammes of gum ammonia in 
powder with a sufficient quantity of alcohol, at362. The 
liquor being filtered, while boiling deposited nothing in 
cooling: there remained on the. filter a white substance, 
which when dried, and, after, being washed in alcohol, 
weighed 5:8 grammes... sdPnivtoamdig 
B. This substance when. heated with water,was in a great 
measure dissolved in it: the liquor when passed through a 
fine cloth lefta grayish, soft, glutinous substance insoluble 
in water and in spirits, of, wine;..of a black colour after its 
desiccation, and of the weight of ,J;}, gramme. It burns 
more easily thanthe gums, produces,a grayish cinder, and 
affords a yellow, colour; withva little oxalic acid on treating 
it by: the. niteie, -agidesidgisiiziio Jo afioisuloe yysoa Dix 
C. The aqueous solution B when evaporated furnished 
4°6 grammes of Bum jjwoeovioaeib, bios oiweqwe on 
1. This gum) js,transparenty, of | a reddish-yellow. colour, 
and of a slightly bitter; tastes tt, is; tolerably, brittle, and is 
easily dried in comparison; withthe other gums.) sis 
2. It burns without, any, apparent flame, producing a 
white cinder which .is. dissolved. with, effervescence,in the 
acids, 2 \ 40 05 tes x13 110.7 eed nsaw bros TE Of 
3. Water dissolves it entirely ;,, this solution scarcely red- 
dens turnsole AINGHUME ssa . Gai byiseqqs ZUIOUKY QWs 
4. It 1s.precipitated. in, abundance and,entinely from its, 
solutions by, the subacetate, of lead; {but mot.with . the 
: . > s 
acetate,) by the niniate-uf lead ;and anereury:, only, the latter 
renders the liguorimikyeisian ood sliceas t6 olcieut, 
5. Lime-water injgxcessdges mot affect. she solution of 
this gum 3. it dogs, aot thesefore, contain phosphorie.acid, 
but its ashes give alittle .phasphate: hence it,seemsato me 
to result that phosphorus, exists,in,,this gom in, a)state of 
combination with the other, elements awhich constitute it. 
6. The oxalate of ammonia, produges,.in its, solution 4 
precipitate of oxalate of lime, but I ajn,ignorant of the acid 
which neutralizes this lime in the gunn *. si, ! 
7. The solution of gall-nuts does not manifest any thing 
remarkable, . 
8. When treated by the nitric acid of commerce, this 
* M. Vauquelin, who recognised the phosphate of lime in the ashes of gum 
arabic and gum tragacauth, thinks that the lime is saturated in a great mea- 
sure in these gums by the acetic acid, 
gum 
