40 THE ATOMIC WEIGHTS. 



For hydrogen, Regnault's mean value is .069263, i 

 .000019. Hence, combining as before, N = 14.0244, =t 

 .0039.* 



The value found by combining both series of experiments 

 is N =- 14.0244, i .0039. 



In discussing the more purely chemical ratios for estab- 

 lishing the atomic weight of nitrogen, we may ignore, for 

 the present, the researches of Berzelius, of Anderson, and of 

 Svanberg. These chemists experimented chiefly upon lead 

 nitrate, and their work is consequently now of greater value 

 for fixing the atomic weight of lead. Their results will be 

 duly considered in the proper connection further on. 



The ratio between ammonium chloride and silver has 

 been determined by Pelouze, by Marignac, and by Stas. 

 The method of working is essentially that adopted in the 

 similar experiments with the chlorides of sodium and potas- 

 sium. 



For the ammonium chloride equivalent to 100 parts of 



silver, Pelouzef found : 



49-556 

 49-517 



Mean, 49-5365. == .013 



MarignacJ obtained the following results. The usual 

 ratio for 100 parts of silver is given also : 



8.063 5,rrm. Ag = 3.992 gnn. NH^Cl. 49-51° 



9.402 " 4-656 " 49-521 



10.339 ■' 5-I20 •• 49-521 



12.497 " 6. 191 " 49-54° 



11.337 " 5.617 " 49-546 



11.307 " 5.595 " 49-483 



4.326 " 2.143 " 49-538 



Mean, 49-523. ± •0°55 



* Professor Le Conte, in his corrections of Regnault's calculations, already 

 cited in a foot note to the chapter on oxygen, finds for the density of nitrogen the 

 value 0.971346. Hence N = 14.0225. This correction is very slight, but it 

 should be considered in any future revision of the atomic weights. 



fCompt. Rend., 20, 1047. 1845. 



X Berzelius' Lehrbuch, 5th Ed., 3d v., 1184, 1185. 



