1 



Rhus cotinus and nemed "fustin-tannide" by Schinld • He 



showed that the fustin-tannide could he decomposed hy acetic 



acid Into tannic acid and a glucoclde, fustln C^gS^g^gl* 



Pustln, on heating with dilute sulphuric acid, gave fisetln 



and a sugar supposed to he rhacmose. Fisetln was also found 



2 

 as a glucoslde compound In Rhus rhodanthema by Perkln . 



The yellow substance which separated from the boiling 

 water solution was farther purified by dissolving In a small 

 quantity of hot alcohol and adding hot water. On cooling, 

 the yellow substance separated out in a flocculent condition. 

 Examined under the microscope, the flakes appeared to be made 

 up of masses of fine crystals. 



An alcoholic solution of the substance gave a black 

 color with ammonia which became red on addition of more am- 

 monia. Concentrated acids intensified the yellow color of 

 the alcoholic solution. Fehling solution and amraonlacal 

 silver nitrate ware reduced by it. Potascium hydroxide 

 added to an alcoholic solution gave at first a deep red color 

 accompanied by a green fluorescence which disappeared leaving 

 a yellow liquid. With an excess of cauatlc potash, the 

 red color returned and was permanent. These reactions are 



1. Berlchte 19, 1725 (1886). 



2. Jour. Chem. Loc. 71, 1194 (1897). 



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