458 Q. 0. Squier — Electro- Chemical Effects, etc. 



become saturated for comparatively small magnetizing forces, 

 and the curve indicates that this occurred at about 10,000 H, 

 beyond which the curve becomes practically horizontal. This 

 further establishes the direct connection between this " throw " 

 and the variation of the magnetization of the exposed point, 

 and confirms the explanation of Professor Rowland, that it is 

 due to the actual attraction of the magnet for iron, and not to 

 any molecular, change produced by magnetization. 



(h) The indirect influence of the magnet caused by the con- 

 centration of the products of the reaction about the more 

 strongly magnetized parts of the iron. 



This tends to produce a higher potential at the more strongly 

 magnetized parts, and finally establishes permanent electric 

 currents, wbich go in the liquid from the more strongly mag- 

 netized to the neutral parts of the iron. This concentration 

 effect increases rapidly with the amount of iron salts present 

 and the fluidity of the solution. 



The convection currents in the liquid are themselves a con- 

 sequence of this same concentration, being electromagnetic 

 rotations produced by the action of the magnet upon the local 

 electric currents between different parts of the iron. 



As to the permanent current, due to the magnet which is 

 finally set up between the electrodes as shown in fig. 1 (II), it 

 is probably due to a change in the character of the reaction 

 produced by the concentration of the iron salts about the more 

 strongly magnetized parts, which would tend to cause a ferrous 

 instead of a ferric reaction to take place, and thus increase the 

 electromotive force. 



Physical Laboratory, Johns Hopkins University, May, 1892. 



Note. — Since the completion of the above investigation, a 

 number of experiments have been performed similar to those 

 of Professor Remsen. Starting with the known existence and 

 direction of the electric currents in the liquid, it was thought 

 that these might lead to some explanation of the peculiar form 

 of deposit in equipotential lines. A number of interesting 

 facts have been noted, but they are withheld for further ex- 

 periment. G. o. s. 



