124 



from all of these genera in the structure of its stamens, and, there- 

 fore, probably ought to be considered a new genus among those 

 producing a gambogioid juice. 



Dr Christison proved, that, at the present time, Ceylon gamboge 

 is not an article of European commerce, and that the whole gam- 

 boge of the markets of this country comes, as in the time of Bon- 

 tius, from China. After mentioning the analysis of fine gamboge 

 made by Braconnot in France and John in Prussia, he stated the 

 following as the mean composition of the several varieties of gam- 

 boge he has hitherto examined : — 



Pipe gamboge of Siam •■ 



llesin, .... 72.2 



Arabin, .... 23.0 



Moisture, .... 4.8 



100.0 



Ceylon gamboge sent by Mrs Colonel Walker : 



Resin, .... 70.2 



Arabin, .... 19.6 



Fibre of wood and bark, . . 5.6 



Moisture, .... 4.6 



Ceylon gamboge, adhering to a specimen of the bark sent by Mr 

 David Anderson Blair : 



Resin, .... 75.5 



Arabin, . . . . 18.3 



CerasLn, .... O.7 



Moisture, .... 4.8 



99.3 



The proportion of the gum to the resin varied somewhat in each 

 V iriety, but never diflFered more than 2 per cent, from the means 

 g'wen above. 



The author added, that he had found the resin to be the active 

 principle of gamboge. 



