S28 



AKALTSIS OF GAMBOGI. 



IX. 



Com])arative Analysis of Gum Resins: hy Mr. Hewrt 

 Bkaconnot, Professor of Natural History) Sfc, 



f Continued from vol. XXVII, p. 37 O.J 



Art. II. Analysis of Gamboge^ 



I.I, 



f rodttctfi of itf 

 Aisiillation. 



Cull. 



Effects of heat Sect. I. JLF gamboge be exposed to the flame of a candle, 

 on gamboge, it swells up; and burns like a resin. Heated in a capgule 

 it emits a peculiar smell, softens, and is decomposed before 

 it melts^ 



Fifty gram. [772 grs.] exposed to distillation produced 



Istj a brown water, containing empyreumatic acetic ucid: 



2d, a small quantity of a light oil: 



3d, afterward came over in considerable quantity another 

 oil, heavy, thick, and brown. 



In the retort remained a light coal, weighing 8 gram. 

 [l23*5 grs]. It was incinerated with difficulty, and left 5 

 decig. [7*7 grs] of ashes, which yielded 2 cent, [0*3 of a gr.[ 

 of potash in part sulphated, 4 cent. [0*6 of a gr.]of phos» 

 phate of lime, 6 cent. [0*9 of a gr.] of carbonate of Urae, 

 and 3 dec. [4*6 grs] of quartz sand, containing a little 

 charcoal, and some traces of oxide of iron. ISo ammonia 

 was found in the liquid products. 



Sect. II. Twenty gram. [309 gr*»] were treated with hot 

 alcohol and filtered. What remained on the filter, after 

 being well washed with alcohol, was a grayish substance, 

 that dried with difficulty, and was then brittle. In this state 

 it weighed exactly 4 gram. [61*7 grs]; had a faint taste, or 

 was nearly insipid; and dissolved entirely in water, except 

 a decig. [1*5 gr.] of impurities. The solution reddened 

 litmus. Evaporated to dryness it left a transparent, friable 

 residuum, resembling the high coloured gum ©f the plum- 

 tree, burning like it with little flame, and leaving a consi- 

 derable quantity of a compact coal, in which was some 

 phosphate of lime. 



The alcoholic solution was red. Evaporated to dryness 



it 



Camboje 

 treated with 

 alcohol, 



