Vol. I, No. 4.] Colouring Principle of Nyctanthes Arbor-tristis. 105 
Pe. 8.| 
does not attach importance to the formule mentioned above. 
It is certain, however, that Sirkar’s results are useless. 
Properties of the colouring matter.—The ef crystals were 
ot. snaohibles in vee very slightly soluble in ether, benzene, 
alcohol, ligroin, moderately soluble in toluene, and readily in 
Biysidine. With strong sulphuric acid they gave an intense blue 
uw hich rapi became yellow through apparent 
absorption of atmospheric moisture. 
m 
author hopes to complete the investigation on some 
future occasion. 
