116 Messrs. A. H. Church and E. Owen on the Bases 



bichloride of platinum : this first crop of platinum salt gave the 

 following result when burnt : — 



0*495 grm. gave 0*1708 grm. platinum. 

 Reducing this number to a per-centage, we have 



Experiment. Theory— Pyridine. 

 Platinum 3450 34*68. 



The filtrate from the pyridine salt yielded another crop of 

 crystals on the addition of more bichloride of platinum; the 

 amount was, however, insufficient for an analysis. 



The pyridine platinum salt yielded pale yellow flocks of the 

 bichloride of plato-pyridyl-ammonium after having been boiled 

 with water for forty-eight hours. 



Picoline. 



Between 130° and 140°, rather more than 70 grammes were 

 obtained in the 9th rectification ; picoline is said to boil at 135°. 

 This fraction proved to be pure picoline. Converted into a plati- 

 num salt, — 



I. 0*5824 grm. gave 0*1922 grm. platinum = 33*01 p. c. 



Between 140° and 145° 100 grammes distilled over, and, like 

 the preceding fraction, were pure picoline. Three successive 

 crops of the platinum salt fractionally precipitated, gave the 

 following numbers : — 



II. 0*3755 grm. gave 0*1238 grm. platinum =32*97 p. c. 



III. 0*441 grm. gave 0*1455 grm. platinum = 32*98 p. c. 



IV. 0*278 grm. gave 0*0916 grm. platinum = 32*95 p. c. 

 The platinum salts of the next fraction gave slightly different 



numbers, indicating a mixture of picoline and lutidine. The oil 

 had been collected between 145° and 150°, and amounted to not 

 less than 60 grammes. 



V. 0*292 grm. gave 0*0958 grm. platinum = 32*81 p. c. 



VI. 0*3056 grm. gave 0*1008 grm. platinum = 32*98 p. c. 



VII. 0*5002 grm. gave 0*1615 grm. platinum = 32*29 p. c. 



VIII. 0*51 grm. gave 01632 grm. platinum = 3200 p. c. 



IX. 0*3372 grm. gave 0*109 grm. platinum = 32*03 p. c. 



X. 0*4816 grm. gave 0*1516 grm. platinum = 31*47 p. c. 



The following is a comparison of the ten preceding experi- 

 mental pcr-centages of platinum, with the theoretical per-centages 

 required by picoline and lutidine : — 



Experiment. Theory. 



I. II. III. IV. V. VI. VII. VIII. IX. X. Picoline. Lutidine. 

 33-01 32-97 32-98 32*95 32-81 32-98 32-29 32-00 32-03 31-47 33-06 31-58 



The quantity of pure picoline at our disposal has induced us 

 to experiment further upon it, in order to obtain some insight 

 into its true constitution. By the action of the bichloride or 



