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CHINOLINE AND ITS HOMOLOGUES. 397 
purification adopted by him. The most satisfactory mode of explanation of the 
differences in the properties of the coal and cinchonine series, as obtained by me, is 
that they are in a peculiar molecular condition, analogous in some respects to the 
phenomena known in the cases of quinine, the amylic alcohol, and many other 
bodies, instances of which are daily becoming more numerous. Chemists are aware 
that even variations in the density and boiling point of the same fluid, when in dif- 
ferent states, have been observed; and I may mention, as corroborative of this, 
that with bases distilled the same number of times, lepidine as pure as I could 
procure it from both sources differed in boiling point by 25° F.; for the lowest frac- 
tion of coal-lepidine that gave correct results on analysis distilled between 485° 
and 495°, whereas the lowest fraction of the same base from cinchonine, boiled be- 
tween 510° and 520° F. Another fact which seems corroborative of the supposi- 
tion that Dr Hormann obtained the chinoline from coal-tar in the state in which 
I procured it from cinchonine, is found in the circumstance that the density of 
chinoline from coal-tar was ascertained by him to be 1-081, or very near the same 
number as in my determination of the density of the same base from cinchonine, 
viz., 1:085. But the coal bases examined by me were lighter than this; for even 
the lepidine from the the last source had a density of only 1-072 at 60° F., being 
actually lighter than the homologue, one step below from cinchonine. 
I have observed with the pyridine series, as obtained from bone-oil, coal- 
naphtha, and bituminous shale, that considerable differences are found in their 
power of forming crystalline salts, and it is, therefore, most probable that the 
same distinctions exist between them that are met with in the case of the bases 
from coal and cinchonine. I trust eventually to be able to elucidate some of 
these points, by subjecting chinoline from both the above substances to the action 
of polarized light. 
The lepidine platinum salt, from cinchonine, precipitates at once in a pulveru- 
lent state; but from coal it is for a few seconds soft and resinous, but soon be- 
comes hard_and crystalline. The following are my analyses of it from the latter 
source :— 
14th rectification, dried at 212°, gave 
9-216 grains crystallized platinochloride of lepidine from fraction boiling 485°-95° 
& 11-652 ... carbonic acid, and 
{ 2-466 ... water. 
5:954 ... platinochloride lepidine from fraction 485°-95°, gave 
Il. ; 
1673 .. platinum. 
8-754 ... platinochloride lepidine from fraction 495°-505°, 14th rectification, gave 
TIL {11:101 ... carbonic acid, and 
2:452 ... water. 
Iv 5:554 ... platinochloride lepidine, same as last, gave 
“\ 1575... platinum. 
5-047 ... platinum salt, 485°-95° crystallized, gave 
1417... platinum. 
VOL. XXI. PART III. DP 
