. CHINOLINE AND ITS HOMOLOGUES. 387 
Nitrate of Chinoline.—In some respects my experiments on this salt tally with 
those of Dr Hormany, in others they differ considerably. It was obtained by the 
last-named chemist by allowing a mixture of leukol and dilute nitric acid to rest 
under a bell-jar; after some time the salt crystallized in confused concentric 
needles, which were obtained white and dry by pressure between folds of filter- 
ing paper. He does not appear to have analysed it. I found that if, after an excess 
of nitric acid slightly diluted was added to chinoline, the fluid was evaporated on 
the water-bath, a pasty mass was obtained, which solidified on cooling. From a 
hot alcoholic solution fine white needles soon deposited, which were infusible at 
212°, and unalterable in the air. Dr Hormany, on the contrary, found his salt 
to fuse on moderate heating, and to rapidly become blood-red by exposure to the 
air; these are, evidently, the characters of an impure substance. The nitrate of 
chinoline was burnt with oxide of copper, a long column of copper turnings being 
placed in the front of the tube. 
6-590 grains of nitrate of chinoline, dried at 212°, gave 
13516  ... carbonic acid, and 
2530 ... water. 
Experiment. Calculation. 
pos 3 Sey, 
Carbon, : : : 55:94 56°25 Cis 108 
Hydrogen, . : : 4:27 4:17 H, 8 
Nitrogen, : ‘ ane 14:58 N, 28 
Oxygen, c : : 208 25-00 O, 48 
100-00 192 
Chinoline gives a very marked reaction with strong fuming nitric acid, and 
which also shows its great stability. If a few drops of the base are allowed to 
trickle down the side of a test-tube, and a small excess of the acid is added, the 
_ two combine with violence, the portion of alkaloid adhering to the sides is con- 
__verted by the fumes of the acid into long needles, and, when cold, the whole fluid 
solidifies to a beautifully white crystalline mass of pure nitrate. No nitrochino- 
line, or any other decomposition product, is formed, if the base be free from im- 
_ purities. 
Bichromate of Chinoline—Guruarpt, in describing this salt,* merely states, 
_ that chromic acid in solution gives, with pure chinoline, an orange-yellow crys- 
_ talline precipitate, and that the dry acid decomposes the base with inflammation, 
_ Dr Hormany, in his paper on the coal bases, previously referred to, states that, a 
_ short time after he had commenced the investigation of leukol, he was inclined 
_ to consider it the same as that GrrHarpT obtained by the action of hydrate of 
_ potash on quinine, cinchonine, and strychnine. He says, however, that he soon 
convinced himself that they were totally distinct, their behaviour towards a 
* Traité de Chimie Organique, troisiéme partie, p. 150. 
