VEGETABLE POWDERS 



257 



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Fig. 55. GAMBOGE. Gamboge. Characteristic appearance of water 

 mounts, a, bits of the gum. They appear to be made up of agglutinated bacteria; 

 b, the emulsified particles resemble bacteria, showing Brownian motion, among 

 which are found larger globules, some colorless and some containing adsorbed 

 minute particles of the gamboge; c, globules from a heated mount. The general 

 color tone is yellowish. 



17 



