Behaviour of Chemical Compounds, 1G7 



proximately the same as that of the salts in solution. Thus, 

 if the molecular magnetism of the ferric salts in their strongly 

 acid solutions is equal to 100, it is (when the salts contain 

 water of crystallization) : — 



For manganous sulphate 100*4 



„ ferrous sulphate 78*5 



„ ferrous ammonium sulphate ... 83*0 



„ cobaltous sulphate 67*2 



„ nickelous sulphate 29*9 



„ didymic sulphate 23'0 



„ cupric sulphate 10"6 



If the salts be deprived of water, their molecular magnetism 

 changes in some cases more considerably. Thus, for the 

 following anhydrous salts it is, compared with the atomic 

 magnetism of the metal in the ferric or manganous salts taken 

 as equal to 100 : — 



Anhydrous cobaltous sulphate 67*2 



„ nickelous sulphate 29*2 



„ cerious sulphate 9*9 



„ cupric sulphate 9'3 



„ ferrous chloride 83*1 



„ cobaltous chloride 82*9 



„ nickelous chloride 33*5 



„ cupric chloride 8*7 



„ cupric bromide 5*2 



The insoluble salts behave similarly. Thus the molecular 

 magnetism for 



Cobaltous phosphate is 64*0 



„ carbonate 60*3 



Manganous phosphate 103*9 



„ carbonate 90*2 



Here, however, it is to be observed that perhaps, on being 

 washed with water, the carbonates have partially de- 

 composed. 



The equality of the magnetisms of the molecules of the 

 different dissolved salts of the same metal, as well as the dif- 

 ferences in the behaviour of the dissolved and the solid salts, 

 may find their explanation in the now pretty generally ac- 

 cepted theory of magnetization, which has gained a sure 

 support especially from the mutual relations between the 

 mechanical and the magnetic behaviour of the substances. 



If the magnetism of bodies is conditioned by the existence 

 of preformed molecular magnets, which in the unmagnetic 

 state have their poles directed to all sides, but under the 



