318 MR C. G. WILLIAMS ON THE VOLATILE BASES 
the bases I had obtained from both sources with the originals discovered by him, 
and the result is, that no doubt remains in my mind of their identity, and I have 
the satisfaction of knowing that Dr AnpERson is of the same opinion. 
The quantity of collidine in the crude chinoline, from 100 ounces of cincho- 
nine, was found to be so small that it became impossible to analyse the base 
itself; the platinum salt, however, was obtained nearly in a state of purity. 
The boiling point of collidine is stated, in the paper before adverted to, to be 
354 F. (179° C.); and on converting the fraction between 350° and 360° F. 
(177°-182° C.), of the tenth rectification into platinum salt, the following numbers 
were obtained,— 
9:895  ... carbonic acid and 
9-290 grains of platinochloride of collidine gave 
Me 
2960 ... water. 
rr. { 3°405 grains of platinochloride of collidine gave 
1020 =... platinum, 
2-400 grains of platinochloride of collidine gave ~ 
ML bags ake 
platinum. 
I. and II. Ill. Calculation. 
—_—_ OOO 
Carbon, 4 : 29-04 ss 29°33 Ca 96 
Hydrogen, . G 3°54 ae 3°66 ny 12 
Nitrogen, : : ane tek 4:31 N 14 
Chlorine, 5 E Boi iss 32°54 Cl, 106°5 
Platinum, : 29°97 30°2 30-16 Pt 98°7 
100-00 327-2 
Collidine was found to exist also in fractions boiling at higher points ; for the 
next fraction to that last analysed gave a salt which yielded, in a platinum de- 
termination, the annexed numbers :— 
7-095 grains of platinochloride of collidine from fraction boiling between 360° and 370° F. 
(182° to 187° C.), tenth rectification, gave 
27145 ... platinum, 
or 30:23 per cent. 
Experiment. Theory. (Collidine). 
30:23 30°16 
One cause of the difficulty of obtaining the Dippel’s oil series from cinchonine 
in a state of purity, was the presence of some basic substance decomposable by 
nitric acid of moderate strength. It was only towards the end of the investiga- 
tion that this was ascertained. If it had been known at the outset, many of the 
distillations, and consequently much loss of material, might in all probability 
have been saved. 
The fraction boiling even as high as 390° F.(199°C.) contained a large proportion 
of collidine ; but it was necessary to act upon it with rather weak nitric acid, and 
then reobtain the base by distillation with potash before converting it into plati- 
