270 Scientific Intelligence. 
liquid ; but, on adding an excess of water to this solution, the new com- 
sess a color somewhat similar to that of the field violet. Concentrated 
sulphuric acid dissolves it, forming a green solution, but excess of water 
en agitat 
with a small quantity of binoxyd of lead, it is converted into aniline 
purple; excess of this reagent changes it into roseine. 
oseine.—This substance nearly always accompanies aniline purple, 
though in very small quantities. It was first noticed publicly by C. 
Greville Williams, and afterward by Dr. David Price. Williams 4 
manganates for its preparation, but Dr. David Price prepared it by means 
of binoxyd of lead. His process is as follows :—To a boiling solution of 
one equivalent of sulphate of aniline, two equivalents of binoxyd of lead 
are added, and the mixture boiled for a short time. The rose-colot 
solution is then filtered, and the filtrate evaporated to a small bulk, which 
causes a certain amount of resinous matter to be separated. This evapo 
means of an alkali; 
dryness, leaves the coloring matter as a dark brittle substance, having 
a slightly metallic reflection. It is much more soluble in water than 
