Behaviour of Chemical Compounds. 1G9 



The salts may also exhibit a similar alteration when their 

 density is increased by drying and heating to redness. In 

 some cases, especially with the salts of the strongly magnetic 

 metals, certainly at first a greater reciprocal action of the 

 magnetically directed elements of the individual magnetic 

 molecular groups, and therefore an augmentation of the 

 temporary moment under an equal external foi'ce, may also be 

 thereby conditioned' — for instance, with the cobaltous and 

 nickelous chlorides. In other cases the rotability of the mag- 

 netic elements in the individual groups of molecules may be 

 diminished. 



The etfect of the alteration of the molecules in consequence 

 of condensation might also be, that the molecular currents 

 induced by the magnet^ which condition the diamagnetic 

 behaviour of the bodies, would, along with the turning of the 

 magnetic atoms endowed with permanent magnetic molecular 

 currents, come forth with greater intensity, whence, therefore, 

 likewise a diminution of the temporary magnetism would 

 result. This is particularly evident with the very dense 

 cupric bromide. That through alteration of the density alone 

 the proper magnetism of the magnetic atoms themselves is 

 changed, is perhaps a scarcely admissible assumption. 



Except in such extreme cases, however, the divergencies 

 between the magnetisms of the dissolved and the solid salts 

 are but slight. Accordingly we say, generally, that loith like 

 chemical properties of the metallic ato7n in the molecule of dif- 

 ferent compounds its atomic inagnetism is also the same. 



7. Magnetic Deportment icith Double Deco7nposition. — The 

 above result is further confirmed by the fact that on mining 

 solutions which, through double elective afinity, mutually 

 exchange their constituents, the total magnetism of the solutionis 

 is the same after as before the double decomposition. 



In the experiments made in reference to this, the flask- 

 shaped glass vessel of the torsion apparatus was first filled up 

 to the mark with each of the solutions to be mixed, A and B, 

 and their magnetisms M„ and M^, deducting the magnetism 

 of the glass, determined, as w^ell as their weights G„ and G^ . 

 After this the glass vessel was partially filled with A and 

 partly with B, so that the total volume of both together was 

 the same as the previous volume of each. The solutions were 

 then mixed by agitation. If the weights of the mixed solu- 

 tions are ga and gb, if there were no reciprocal action their 

 common magnetism, after deducting that of the glass, 

 would be n n. 



