382 MR C. G. WILLIAMS’ RESEARCHES ON 
450° and 460° F. gave 
8-900 grains of platinum-salt of chinoline from fractions boiling between 
10°559 ~~ ..._~—s carbonic acid and 
2-191 ... water, and 
6-235  ... platinum salt of chinoline, gave 
1827... __ platinum. 
IL. | 6057  ... _ platinum-salt of chinoline gave 
1772 ~~... platinum. 
10. 5-907 ... _ platinum-salt of chinoline gave 
1:731- .,. + platinum. 
or, per cent.— 
I. Il. Ets Mean. 
Carbon, : s 32°36 Le. ie 32°36 
Hydrogen, : : 2°74 oe doe 2°74 
Nitrogen, : ard Hoe vets nae 
Chlorine, ‘ ses se ae bes 
Platinum, 5 29°30 29-26 29°30 29:29 
In the following table, the result of all my analyses (including those in the 
former paper) is compared with the numbers required by theory; the analysis just 
quoted being the fourth in the series :— 
TE: Il. Ill. IV. is VI. Mean. Theory. 
Carbon, . . 31:98 32:24 32°52 32°36 ae Ms 32:26 32°19 
Hydrogen, . 3:09 2°62 2°58 2°74 re es 2°76 2°39 
Nitrogen,. . 206 bbe Sac 008 so ae aes 4:17 
Chlorine,.  . Ree ae at one a2 ay dia 31-74 
Platinum, . 29°44 29°30 29°60 29:30 29:40 29:26 29:38 29°51 
100-00 
It will be seen that there is a slight excess both in the carbon and hydrogen of 
these analyses. This arises from the presence of a small quantity of lepidine, the 
platinum salt of the two bases being too nearly of the same degree of solubility to 
allow of separation by fractional crystallization. This source of error is much 
lessened in the other salts, their formation, in most cases, being a process of puri- 
fication. Platinochloride of chinoline is very sparingly soluble in cold water, 
requiring 893 parts for solution at 60° F. 
It is to be remembered, that all the chinoline compounds mentioned in this 
paper were made from a base procured by distillation of cinchonine with potash, 
the coal-chinoline requiring a tedious series of purifications, in addition to the 
fractional distillations, before it could be obtained pure enough for conversion into 
compounds fit for analysis. The platinum-salt is, however, more easily obtained 
in a pure state from the coal bases, than most other compounds of this alkaloid. 
In the following table, the mean result of my analyses of the platinum-salt of 
chinoline is compared with those obtained by other observers,* whose numbers 
have been recalculated according to the present atomic weight of carbon. 
* GerrRHARDT, loc. cit, 
