314 MR C. G. WILLIAMS ON THE VOLATILE BASES 



to be mentioned. The mother liquid, on treatment in the manner described in my 

 former paper, namely, exposure to a desiccating surface gave a crop a 7 , 



2-780 grains of platinum salt a 7 gave 

 •880 ... platinum, 



or 31 65 per cent. 



Experiment. Theory. (Lutidine.j 



31-65 31-50 



The mother liquor of a gave b on evaporation, 



5-327 grains of platinum salt b gave 

 1-635 ... platinum, 



or 30-70 per cent., being almost exactly the same result as a 2 and a s . 



The mother liquor of b gave a crop of white needles, the nature of which I 

 have not yet been able perfectly to comprehend. I have, however, observed 

 them to exist in the very last crops of many platinum salts of different kinds, 

 more especially when evaporated by the aid of heat. They are soluble in hot 

 water, and at a red heat leave metallic platinum. They do not deflagrate when 

 thrown into melted nitre. Solution of potash does not decompose them, the 

 aqueous solution is not precipitated by alcohol ; the solution in boiling water 

 precipitates nitrate of silver. 



2-182 grains gave on ignition 

 1-672 ... of platinum, 



or 73 50 per cent. 



When it is considered that even protochloride of platinum requires 76*6, it will 

 be seen that this experiment does not throw much light on their nature.* The 

 quantity I have as yet been able to obtain has been too small to allow of a further 

 development of their history. 



The mother liquid of these crystals yielded a resin not further examined, which 

 was the last product of the mother liquid of a. 



These results, — although the numbers obtained are as close as could be expected 

 to the theoretical values, and prove that the bases to be described more fully fur- 

 ther on, were not produced during the distillations, — were, of course, quite insuffi- 

 cient to settle the points sought to be determined : it became necessary therefore 

 to examine minutely each of the fractions obtained by the distillations previously 

 alluded to. It may be mentioned here, that in order to remove any objections 

 that might be urged as to the bases being produced from the decomposition of 

 nitrogenous impurities existing in the cinchonine employed, an analysis was 

 made with the following results, — 



{7'25 grains of cinchonine dried at 212° gave 

 20-56 ... carbonic acid and 

 5-28 . . . water, 

 f 8-03 ... cinchonine dried at 212° gave 



II. 



5 - 64 ... water. 

 * It was probably a salt analogous to the bases of Reiset or Gros, mixed with some impurity. 



