Dr, Faraday on Magnetic and Diamagnetic Action, 243 
_ 2446. In reference to the manner in which. it is possible for 
electric force, either static or dynamic, to be transferred from par- 
ticle to. particle when they are at a distance from each other, or 
across a vacuum, I have nothing to add to what I have said. be- 
fore. The supposition that such can take place, can present 
nothing startling to the mind of those who have endeavored to 
comprehend the radiation and the conduction of heat under one 
_ principle of action. | mR 
2447. When we consider the magnetic condition of the earth 
asa whole, without reference to its possible relation to the sun, 
and reflect upon the enormous amount of diamagnetic matters 
which, to our knowledge, forms its crust ; and when we remem- 
ber that magnetic curves of a certain amount of force and uni- 
versal in their presence, are passing through these matters and 
keeping them constantly in that state of tension, and therefore 
of action, which I hope successfully to have developed, we can- 
not doubt but that some great purpose of utility to the system, 
and tous its inhabitants, is thereby fulfilled, which now we shall 
have the pleasure of searching out. : 
2448. Of the substances which compose the crust of the earth, 
by far the greater portion belongs to the diamagnetic class; and 
though ferruginous and other magnetic matters, being more ener- 
getic in their action, are consequently more striking in their phe- 
Nomena, we should be hasty in assuming that therefore they over- 
tule entirely the effect of the former bodies. As regards the 
Ocean, lakes, rivers, and the atmosphere, they will exert their pe- 
culiar effect almost uninfluenced by any magnetic matter in them : 
_ and as respects. the rocks and mountains, their diamagnetic: in- 
fluence is perhaps greater than might be anticipated. I mention- 
ed that, by adjusting water and a salt of iron together, I obtained 
@ solution inactive in air (2422); that is, by a due association of 
the forces of a body from each class,, water and a salt of iron, the 
Magnetic force of the latter was entirely counteracted by the di- 
amagnetic force of the former, and the mixture was neither at- 
tracted nor repelled. T'o produce this effect, it required that 
More than 48-6 grains of crystallized protosulphate of iron should 
be added to ten cubic inches of water (for these proportions gave 
@ solution which still set equatorially), a qtiantity so large, that I 
Was greatly astonished on observing the power of the water to 
Overcome it. It is not therefore at all unlikely that many of the 
