﻿Intelligence and Miscellaneous Articles. 317 



VI. If u s stand for the atomic magnetism of the dissolved salts of 

 the magnetic metals, the atomic magnetism Uh of their hydrated 

 oxides freshly precipitated from their solutions is as follows : — 



Hydrated nickel monoxide .... Uh = \'00u s 



„ cobalt monoxide , 1*12 



ferrous oxide 1*12 



,, manganous oxide 0*85 



,, cupric oxide 0*74 



,, chromic oxide 0*95 



ferric oxide 0-69-W8 



Thus the atomic magnetism of the hydrates of the magnetic metals 

 is partly equal to, and partly smaller or somewhat larger than that of the 

 corresponding salts ; so that, having regard to the influence of density, 

 it may be assumed that the group which determines the magnetism 

 in them has the same constitution as in the corresponding salts. 



VII. On precipitating ferric hydrate from its salts, the atomic 

 magnetism of the precipitated oxide rapidly rises from 0'67 to 

 \'\29u s ; this is probably due to the circumstance that in the first 

 few moments the ferric hydrate is still partially dissolved in the col- 

 loidal condition. 



The colloidal dissolved ferric oxide has an atomic magnetism 

 (100*2) which is only about 0*2 that of the ferric salts. In like 

 manner the feeble atomic magnetism of ferric acetate under different 

 circumstances (114 to 147) shows that in this case also a great part 

 of the ferric oxide is dissolved in the colloidal state. In any case 

 the magnetic atomic group in this colloid ferric oxide is different from 

 what it is in the precipitated ferric hydrate and in the ferric salts. 



This difference is not met with in the chromic oxide dissolved in 

 potash, where the chromium both before and after coagulation has 

 the same atomic magnetism as in the salts. In like manner the 

 atomic magnetism of nickel monoxide dissolved in ammonia is the same 

 as that of the hydrate. 



VIII. The magnetism of the oxides of the magnetic metals is far 

 less than that of the salfs ; yet it is different according to the mode 

 of preparation and the density. The atomic magnetism was found 

 to be, for 



Freshly ignited nickel monoxide 66'4 



,, „ didymic oxide 55*0 



„ „ cupric oxide 10*5 



„ „ manganous oxide 144'0 



,, „ chromic oxide 66 



„ „ chromic oxide precipitated along 1 ,~,_ 



with alumina J 



„ „ ferric oxide 59 



„ „ ferric oxide precipitated along 1 2 _ fi 



with alumina J 



It cannot yet be determined whether the magnetism of the oxides, 



