22 Dr. TV. Ramsay on Pieoline and its Derivatives, 



Victor Mover, and described in the Berichte der deutschen 

 chemischen Gesellschaft> ix. p. 1216. 



Results. Taken, 0*0151 gram. 



Weight of empty bulb 11-6 grams. 



Weight of bulb full of alloy... 199-6 „ 

 Weight of bulb after heating. 58*3 „ 



Height of barometer 750 millims. 



Height of alloy in tube above 



level in bulb 60 „ 



The formula given by Meyer (Berichte, 1877, p. 2070), 

 S . 1543500 



where D is the vapour-density compared with air; 



S the weight of substance taken; 



P the height of the barometer; 



p the height of alloy in tube, above level in bulb; 



a the amount of alloy used; 



9-608 the spec. grav. of the alloy at 100°; 



9-158 „ „ „ 446°; 



r the weight of alloy remaining in the bulb after the 



operation is over. 



Substituting the numbers found, 



0-0151 x 1543500 



D " /rKA , AN f /188-0\ 1 M ( 46-7 \ 1 — ' 06 > 

 (7504-40)1^)1-01-^)} 



or, compared with hydrogen, 2 9 -22. The molecular weight 

 of C 5 H 5 N is 79, and of 2C0 2 88. Adding these together 

 and dividing by 6 we get 27*8. It is therefore clear that the 

 above equation is correct, and that /3-dicarbopyridenic acid 

 decomposes into pyridine and carbonic anhydride at the 

 boiling-point of sulphur. 



Reactions of fi-Dicarbopyridenic acid. — A cold saturated so- 

 lution gave no precipitate with the following salts: — Ca Cl 2 , 

 Ba Cl 2 , Ba H 2 2 , Mg S0 4 , Zn S0 4 , Cd Cl 2 , Ni (N0 3 ) 2 , 

 Co (N0 3 ) 2 , Hg Cl 2 , alum, chrome-alum, Mn 01 2 , Sn Cl 4 . With 

 ferric chloride it gave a white flocculent precipitate soluble 

 in hydrochloric acid ; the precipitate, on addition of ammonia, 

 turned reddish-brown in colour, and apparently changed to 

 ferric hydrate. With mercurous nitrate it gives a bulky 

 white precipitate ; with copper sulphate a light blue precipi- 

 tate, turning darker on drying ; with lead nitrate a heavy 

 white crystalline precipitate after some time ; and with silver 

 nitrate white crystalline flocks very sparingly soluble in water. 



