PRODUCED BY DISTILLATION OF CINCHONINE. 313 



fectly dry state. The mass dissolved immediately in strong alcohol, showing the 

 absence of ammonia. To the solution, a slight excess of bichloride of platinum 

 was added, when a voluminous precipitate (a) was obtained ; the mother liquor of 

 a, on evaporation, gave a crop of crystals b, the fluid from which gave another 

 crop c. 



The precipitate a was the first examined ; it was dissolved in hot water, and 

 on cooling deposited a crop of crystals, which was evidently a mixture, for it con- 

 sisted of large orange crystals a 3 , and exceedingly small needles a k ; a 3 was capable 

 of being perfectly freed from « 4 by sifting through muslin ; the latter was not, how- 

 ever, absolutely free from small fragments of a 3 , and was therefore further ex- 

 amined, as will be presently seen. 



5295 grains of a 5 dried at 212° gave 

 1-625 •■• platinum, 



or 30*69 per cent., a number intermediate between lutidine and collidine. 



The mother liquid of the crops a z and of gave a crystalline deposit a/, which 

 had the same crystalline form and appearance as a 3 , but a little more brilliant in 

 colour. 



4-955 grains of a 2 dried at 212° gave 

 1*520 ... platinum, 



or, 3067 per cent. It will be seen, therefore, that a 2 and a 3 agree not only in 

 form but also in composition. 



The mother liquid of a 2 on evaporation over sulphuric acid, gave another crop 

 a 21 ' , which was, therefore, the third crop from a. 



2-245 grains of a? b dried at 212° gave 

 •740 ... platinum, 



or 32*96 per cent., which is almost exactly the theoretical percentage in picoline for 



Experiment. Theory. (Picoline.) 



32-96 32-94. 



It has been said that a* contained a little of a 3 intermixed ; it was therefore 

 treated with hot water, which separated it into two portions, one less soluble a 5 , 

 and a solution which on cooling deposited a crop of crystals a 6 . The portion of 

 a 3 which was present was very minute, and remaining in solution did not effect 

 the results given by a 5 and a 6 . 



3-205 grains of a 5 platinum salt gave 

 1-010 ... platinum, 



or 31-51 per cent. 



Experiment. Theory. (Lutidine.J 



31-51 31-51 



3-970 grains of a 6 platinum salt gave 

 1-150 platinum, 



or 28*96 per cent., a number intermediate between chinoline and lepidine, presently 

 vol. xxi. part 11. 4 p 



