Pee et ee pe ee) ee 
Physics and Chemistry. 125 
colored blue by chlorid of lime—nor with the benzylamine of 
Limpricht—which boils at 183°—nor with the alkaloid described 
endius—which distils between 182° and 187°5°. To compare 
fectly pure. The aniline was prepared from Coupier’s product, 
hi ; 
toluidine, was freed trom toluidine by converting it into chlorhy- - 
rate and recrystallization. Pure aniline chlorhydrate was thus 
obtained, 129°4 parts of which required 100 parts of water at 
‘7° for solution. Aniline oxalate crystallizes easily in right 
isms, and is the most soluble in water of the three 
oxalates. Pseudo-toluidine chlorhydrate also crystallizes in the 
ortho-rhombic system, the erystals having a peculiar tendency to 
collect any coloring matter accidentally in the solution at their two 
extremities, the middle being colorless; some of the erystals were 
violet-red at one end, and a yellowish green at the other. 3774 
tained pure by recrystallization, 22°9 parts required 100 parts of 
water at 11° for solution. It crystallizes in the monoclinic sys- 
h 
50,); the reagents ma 
be divided into two classes, whose action is diametrically opposite : 
the one including chlorine and active oxygen, the other nitric acid 
ith th e 
and the mixtures which produce it. With the first named he pro- 
ceeds thus: dry aniline is dissolved in sulp acid of density 1°84, 
and a little chromic acid in the same acid dropping 
in water dr p, an intense blue color is developed which 
1s deepest after the acid is dilu with one half its volume 
rine, manganic and plumbic peroxyds, electrolytic oxygen and a 
mixture of nitric and chlorhydric acids may be used. parc. diz- 
i u 
ent, 
sodic chlorid and ‘01 of niter were mixed together and 
‘01 grm.—corresponding to z}y of a milligram of nitrate— 
