318 MR C. G. WILLIAMS ON THE VOLATILE BASES 



the bases I had obtained from both sources with the originals discovered by him, 

 and the result is, that no doubt remains in my mind of their identity, and I have 

 the satisfaction of knowing that Dr Anderson is of the same opinion. 



The quantity of collidine in the crude chinoline, from 100 ounces of cincho- 

 nine, was found to be so small that it became impossible to analyse the base 

 itself; the platinum salt, however, was obtained nearly in a state of purity. 



The boiling point of collidine is stated, in the paper before adverted to, to be 

 351° F. (179° C); and on converting the fraction between 350 5 and 360° F. 

 (177°-182° C), of the tenth rectification into platinum salt, the following numbers 

 were obtained, — 



{9-290 grains of platinochloride of collidine gave 

 9895 ... carbonic acid and 

 2-960 ... water. 



T3-40? 

 * { 1-021 



405 grains of platinochloride of collidine gave 

 ... platinum. 



TTT f 2-400 grains of platinochloride of collidine gave 

 * \ -725 ... platinum. 





I. and II. 

 29-04 



III. 





Cal 



•ulation. 





Carbon, 



29-33 





C 16 



96 



Hydrogen, 



3-54 





3-66 





H 12 



12 



Nitrogen, 



... 





4-31 





N 



14 



Chlorine, 



, . 





32-54 





Cl 3 



106-5 



Platinum, 



29-97 



30-2 



30-16 





Pt 



98-7 



100-00 327-2 



Collidine was found to exist also in fractions boiling at higher points ; for the 

 next fraction to that last analysed gave a salt which yielded, in a platinum de- 

 termination, the annexed numbers : — 



> 



7-095 grains of platinochloride of collidine from fraction boiling between 360° and 370° F. 



(182° to 187° C), tenth rectification, gave 

 2-145 ... platinum, 



or 3023 per cent. 



Experiment. Theory. (Collidine). 



30-23 30-16 



One cause of the difficulty of obtaining the Dippel's oil series from cinchonine 

 in a state of purity, was the presence of some basic substance decomposable by 

 nitric acid of moderate strength. It was only towards the end of the investiga- 

 tion that this was ascertained. If it had been known at the outset, many of the 

 distillations, and consequently much loss of material, might in all probability 

 have been saved. 



The fraction boiling even as high as 300° F. (199° C.) contained a large proportion 

 of collidine ; but it was necessary to act upon it with rather weak nitric acid, and 

 then reobtain the base by distillation with potash before converting it into plati- 



