272 Scientific Intelligence. 
tin in the form of a proto-compound, The aqueous solution of the 
coloring matter and hydréchlorate of aniline is then boiled, so as to vol- 
atilize any free aniline it may contain, and then saturated with chlorid 
of sodium. The chlorid of sodium causes the coloring matter to separate 
as a semi-solid pitchy substance, of a golden-green aspect, while the 
hydrochlorate of aniline remains in solution. The coloring matter thus 
obtained may be further purified by digestion with benzole, which dis- 
solves out a certain amount of resinous matter. 
Preparation of Fuchsine by the Action of Nitrate of Mercury on Anm- 
line-—-When protonitrate of mercury is left in contact with aniline for 
some time it forms a white pasty mass; but when carefully heated to 
170° or 180° centigrade, it reacts upon it, forming a brown liquid, which 
gradually changes till of a dark crimson color,‘ At the same time, the 
whole of the metal 
by the oxydizing action of nitrate of mercury is the nitrate of fuchsine. 
My reason for stating this is, that, on examining the coloring matter 
obtained by chlorid of tin, I found it to contain large quantities of com- 
bined hydrochloric acid, and, when nitrate of m was used, CoD 
rable quantities of combined nitric acid; therefore, I concluded that the 
_ Fuchsine is separated from its salts by precipitation with a small ef 
difficultly soluble in water, though tolerably soluble in alcohol ; it is not 
i hlorie acid 
saat eae 
ee See 
ge a aoe 
precipitate fuchsine from its salts; but, at the same time, ¢ 4 
considerable quantity of it, forming nearly colorless liquids) 
