714 [Recess, 



dissolves in alcohol, forming n violet solution, which immediately 

 assumes a purple colour on the addition of acids. It is insoluble, or 

 nearly so, in ether and henzole. It is also a very stable body, and 

 decomposes ammoniacal salts readily. When heated strongly it de- 

 composes, yielding a basic oil. Its analysis has led to the formula 



C 27 *H 24 N r 



Hydrochlorate ofMauveine. This salt is prepared by the direct 

 combination of mauveine with hydrochloric acid. From its boiling 

 alcoholic solution it is deposited in small prisms, sometimes arranged 

 in tufts, possessing a brilliant green metallic lustre. It is moderately 

 soluble in alcohol. Carbon, hydrogen, nitrogen, and chlorine deter- 

 minations have led to the formula 



C 27 H 24 N 4 HC1. 



I have endeavoured to obtain a second hydrochlorate, but up to the 

 present have not succeeded. 



Platinum-Salt. Mauveine forms a perfectly definite and beauti- 

 fully crystalline compound with bichloride of platinum, which, if 

 prepared with warm solutions, separates in the form of crystals of 

 considerable dimensions. It possesses the green metallic lustre of 

 the hydrochlorate, but on being dried assumes a more golden colour. 

 It is very sparingly soluble in alcohol. The analysis of this salt 

 has led to the following formula, 



C 27 H 24 N 4 , HPtCl 3 . 



Gold- Salt. This substance separates as a crystalline precipitate, 

 which, when moist, presents a much less brilliant aspect than the 

 platinum derivative ; it is also more soluble in alcohol than that 

 salt, and when recrystallized appears to lose a small quantity of gold. 

 Its analysis has given numbers agreeing with the formula 



C 27 H 24 N 4 , HAuCl 4 . 



Hydrolromate of Mauveine. This salt is prepared in a similar 

 manner to the hydrochlorate, which it very much resembles, except 

 that it is less soluble. Carbon, hydrogen, and bromine determina- 

 tions give results agreeing with the formula 



C 27 H 21 N 4 ,HBr. 



Hydriodate ofMauveine. In preparing this salt from the base, it 



* C=12. 



