6 [March 6, 



very small proportion of the compound is obtained in the perfectly 

 white condition. The base is somewhat more soluble in alcohol, the 

 solution having a deep-red colour; it is insoluble in ether. Exposed 

 to the action of the atmosphere, rosaniline turns rapidly pink, and 

 ultimately dark red. No perceptible alteration of weight is ob- 

 served during this change. At the temperature of 100 the base 

 rapidly loses a minute quantity of water of interposition ; it may 

 then be heated to 130 without further losing weight. At a higher 

 temperature rosaniline is decomposed with evolution of an oily 

 liquid containing much aniline, a quantity of charcoal remaining 

 behind. 



The combustion of rosaniline has led to the formula 



C 20 H 21 N 3 0=C 20 H 19 N 3 ,H 2 0, 



which has been corroborated by the examination of numerous well- 

 characterized salts and derivatives. 



Hosaniline is a well-defined powerful base, which forms several 

 series of salts, nearly all remarkable for the facility and beauty with 

 which they crystallize. The proportions in which this substance 

 unites with acids characterize it as a triacid triamine. Like several 

 other triamines which I have examined, it will probably be found to 

 produce three classes of salts, viz., 



C 20 H 19 N 3 , HC1, 



C 20 H 19 N 3 ,2HC1, and 



C 20 H 19 N 3 ,3HC1. 



Up to the present moment, however, I have been able to obtain only 

 representatives of the first and the third of these classes. The predilec- 

 tions of rosaniline are essentially monacid. The salts with one equiva- 

 lent of acid are wonderfully stable compounds. I have recrystallized 

 them four and five times without producing the slightest alteration in 

 their composition. The salts with three equivalents of acid present 

 comparatively little stability, being, in fact, decomposed by the action 

 of water or by exposure to 100. 



By a glance at the formula given, it is obvious that the white cry- 

 stals of the base itself, which were submitted to examination, are a 

 hydrate, the saline compounds of rosaniline, as might have been 

 expected from many of the processes of their formation, containing 

 no oxygen. The salts of rosaniline may be obtained by two differ- 

 ent processes : either by the direct action of the respective acids, or 



