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’, 
2°780 grains of platinum salt a”? gave 
{ONE bce platinum, 
or 31°65 per cent. 
Experiment. Theory. (Lutidine.) 
31°65 
The mother liquor of a gave / 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 @° and a’. 
The mother liquor of } 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. 
grains gave on ignition 
of platinum, 
or 73°00 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 he 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,— 
f 7-25 grains of cinchonine dried at 212° gave 
I. ¢ 20°56 a carbonic acid and 
\ 5°28)) ioe water. 
II { 8:08)5 ten cinchonine dried at 212° gave 
: 5:64 ae: water. 
* It was probably a salt analogous to the bases of Reiset or Gros, mixed with some impurity. 
