1881.] 



On the Action of Sodium upon Chinoline. 



541 



Preparation of the Platinum Salt from the Scarlet Hydrochloraie of 



Dichinoline. 



The scarlet hydro chlorate of dichinoline was dissolved in boiling 

 water, and precipitated while boiling by an excess of platinic chloride. 

 The high temperature of the solution was necessary to prevent the 

 precipitation of the hydrochlorate with the platinum salt. The latter 

 was of a beautiful pale cadmium yellow colour. The filtrate on 

 cooling yielded fine needles in extremely small quantity. The pre- 

 cipitate contained 24" 54 per cent, of platinum, and probably, there- 

 fore, had the same composition as those before mentioned, containing 

 the same or nearly the same amount of platinum. The needles con- 

 tained 35*7 per cent, of platinum, and it is most likely that the 

 presence of a small quantity of this salt was the cause of the high 

 platinum in the first precipitate. A direct combination of dichinoline 

 with platinic chloride — 



Cisni^.PtCl 4 , 



would require 33-11 per cent, of platinum, but it is not easy, as I have 

 said before, to admit such a formula, when it is remembered that the 

 precipitation took place in the presence of hydrochloric acid. 

 A salt of the formula — 



2(C 18 H 14 N2)HC1.2PtCl 4 , 



would require 33*66 per cent, of platinum, and would only differ from 

 the salt — 



2(C 18 H 14 N2)HCl.PtCl 4 , . 



before alluded to, and which contains 22*18 per cent, of platinum, 

 by containing one more equivalent of platinic chloride. It must, 

 however, be distinctly stated that the numbers in this paper are given 

 provisionally, and that the subject is still under study. 



Presents, March 3, 1881. 



Transactions. 



Eastbourne : — Natural History Society. Papers, 1879-80. 8vo. 



The Society. 



Edinburgh : — Geological Society. Transactions. Vol. III. Part 3. 



8vo. Edinburgh 1880. The Society. 



Scottish Meteorological Society. Journal. New Series. Nos. 



55-59. 8vo. Edinburgh. The Society. 



Glasgow : — Philosophical Society. Proceedings. Yol. XII. No. 1. 



8vo. Glasgow 1880. The Society. 



