262 PHOSPHORUS. 



Ni = 58. NICKEL, 



The most promising salt to be used appears to be the 

 double salt Kaz O* S-fNi O* S -f- 6 H 2 = 436. Unfor- 

 tunately Sommaruga, 1866, resorted to the Barium Sulphate 

 process : 



Ni Salt: Ba O4 S =436 : 466 = 0.93 562. Chg. 22 high. 

 He made six determinations ; 654 645 : 9. Mean 89 high, 

 corresponding to Ni =. 58.4. 



Ni : Ni O = 58 : 74 = 0.78 378. Change 29 high. 



The analytical excess, from Russell, 1863, to Kriiss and 

 Schmidt, 1892, has been brought down from 215 high to 66 

 high; but this last still represents 0.3 on the atomic weight, 

 high! 



= 16 OXYGEN. 



This value is determined by Dumas, 1840; for we take 

 Diamond-Carbon as our Standard of Matter (Comptes 

 Rendus, T. 117, pp. 1075-1078; 1893, and True Atomic 

 Weights, 1894, pp. 174-175). 



Since for O = 16 we found C = 12 exactly, it follows that 

 adopting C 12 exactly, we obtain O=i6 by the same set 

 of determinations. 



Osn=191 OSMIUM. 



Seubert, in 1888, made use of the Chloro-Osmiates of 

 Ammonium and of Potassium; the reaction is atomically 

 dull, a change of only about 12 for one-tenth unit on the 

 atomic weight of osmium. 



In his second paper, the ammonium salt gives the mean 

 analytical excess 47 high, the potassium salt 74 low. 



Hence, the former points to 0.4 high, the latter to 0.6 low. 



All we dare say is that 191 will probably prove the true 

 value. 



P 31. PHOSPHORUS. SCHROETTER, 1851. 



P2 Os : p2 = 142 : 62 = 2.29 032. Chg. 420 low. 



Schroetter, 1851, 10 Det., 300 783; 517. Mean 113 low. 

 Van der Plaats, 1885, 2 Det., 201 072; 129. " 104 high. 

 Mean of both series, " 5 low. 





