208 



PROFESSOR T. ANDERSON ON THE PRODUCTS OF THE 



Dipyridine carefully dried in the water bath was found on analysis to give 

 these results : — 



i o- 



0-2802 gramme dipyridine gave 



7782 ... carbonic acid, and 

 0-1497 ... water. 



( 0*3000 gramme dipyridine gave 

 II. -I 0-8367 ... carbonic acid, and 

 I 0-1575 ... water. 





Experiment. 



Calculation. 







I. 



II. 









Carbon, 



75-74 



7607 



75-94 



c, 



60 



Hydrogen, 



594 



5-83 



6-33 



H 5 



5 



Nitrogen, 



. 





17-73 



N 



14 



100-00 



79 



These numbers lead to the formula C 5 H 5 N, which is that of pyridine itself. 

 The platinum compound of the base, which is thrown down as a yellow 

 crystalline powder, gave the following results : — 



I. 



II. 



III. 



IV. 



0-3345 gramme gave 

 0-1175 ... platinum. 



0*2007 gramme gave 

 0-0685 ... platinum. 



0-4335 gramme gave 

 0-1473 ... platinum. 



0-4052 gramme gave 



0'3087 ... carbonic acid, and 



0-0905 ... water. 







Experiment. 







Calculation. 







I. 



II. 



III. 









Carbon, 





... 



20-78 



21-02 



c 10 



120 



Hydrogen, . 



• ■ • 





2-48 



210 



H 12 



12 



Nitrogen, 









4-90 



N 2 



28 



Chlorine, 









37-30 



ci 6 



213 



Platinum , 



3411 



34-12 



34-03 



34-68 



Pt 



1974 



10000 



570-4 



This agrees with the formula (C 5 H 5 NHCl) 2 PtCl 4 , which is identical with that of 

 the pyridine salt. In order to fix the true constitution of the base, it was necessary 

 to determine its vapour density, and as its boiling point was beyond the range of 

 the mercurial thermometer, it was necessary to use a bath of metallic lead and 

 an air thermometer. The air thermometer was a bulb of the same size as that 

 used for containing the vapour, and the details of the experiment were as fol- 

 lows : — 



