382 



MR C. G. WILLIAMS RESEARCHES ON 



8-900 grains of platinum-salt of chinoline from fractions boiling between 

 450° and 460° F. gave 



I.« 



10-559 ... 



carbonic acid and 







2-191 



water, and 









6-235 

 1827 ... 



platinum salt of chinoline, gave 

 platinum. 





TT f 6-057 ... 

 LL '\ 1-772 .. 



platinum-salt of chinoline gave 

 platinum. 





Ill { 5 ' 907 - 

 111, \ 1-731 .. 



platinum-salt of chinoline gave 

 platinum. 





or, per cent. — 











I. 



II. ill. 



Mean. 



Carbon, 



3236 





32-36 



Hydrogen, 



Nitrogen, 



2-74 





2-74 



Chlorine, 



• • ■ a a 



... 







Platinum, 



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 : — 





I. 



II. 



III. 



IV. 



v. 



VI. 



Mean. 



Theory 



Carbon, 



. 31-93 



32-24 



32-52 



32-36 







32-26 



32-19 



Hydrogen, 



. 3-09 



2-62 



2-58 



2-74 







2-76 



2-39 



Nitrogen, . 

















4-17 



Chlorine, . 

















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. 



* GrERHARDT, loc. cit. 



