284 Prof. G. Wiedemann on the Magnetic 



solution (12) ; so that to these salts a common structure, but 



one essentially different from the constitution of the ordinary 



cobaltous salts, may be attributed. 



With the nickel salts no such anomalies are exhibited. Thus, 



e.g., there Avas obtained for the following salts: — 



G. M. «. 



NiO, 2 Ko 0,3X203 0-5117 29-7 27-4 



NiO, BaO, Ko 0, 3X2 O3... 0-4224 24-9 27*9 

 NiO, SrO, Ko 0, 3N2 O3... 0-4088 25-5 27-9 

 XiO, CaO, K2 0, 3X2 O3... 0-3919 23-4 28'2 



NiS04, 4XH3, 2H.0 0-5021 30*9 28-9 



MO, N2 O3, 4NH3 0-8341 59-9 29*1 



Ferric chloride 0-1244 27-1 100 



From previous investigations the following is the magnetism 

 of the atom of nickel in the salts 



NiS04, 4XH3, 2H2 29-1 



Ni(N03)2,4NH3, 2H2O 28-0 



Considering the number of diamagnetic substances which, 

 especially in the four salts first mentioned, are combined with 

 nickel, the diminution of the magnetism, compared with that 

 of the ordinary nickelous salts (30-5), may not be too great. 

 Therefore we cannot assume that the nitrous double salts of 

 nickel, similarly to the cobalt salts Avith a perfectly analogous 

 composition, possess a constitution essentially different from 

 that of the ordinary nickelous salts ; much rather do they at 

 once connect themselves with the latter. Finally, in the am- 

 moniacal salts of nickel the ammonia may, as in the analo- 

 gously composed cobalt-salts, be attached, like water of crys- 

 tallization, to the unaltered protoxide salts merely by a mole- 

 cular union. 



The same behaviour is exhibited (as I have previously 

 shown) by the ammoniacal copjjer-salts. The atomic magne- 

 tism of the copper in them came out as follows: — 



a. 



Dissolved cupric salts 10*8 



CuSO^, 5NH3 9-3 



CUSO4, NH3 9-7 



CUSO4, 4XH3, H2O 9-0 



CUSO4, 2NH3 9-6 



CuCl2, 2NH3 10-1 



CuBr2, 2NH3 9-8 



According to this the view of Graham *, that copper replaced 

 * A?in. d. Chem. u. Pharm. toI. xxix, p. 29. 



