34 Dll. FARADAY’S EXPERIMENTAL RESEARCHES IN ELECTRICITY. (SERIES XXVI.) 
to move equatorially or across the lines of magnetic force ; it however had no tendency 
to do so under the influence of the magnetic force. The other cylinder was attached 
to a copper wire handle, and could be placed in a fixed position on either side of the 
former cylinder ; it was therefore adjusted close by the side of it, and the two retained 
together until all disturbance from motion of the fluid or of the air had ceased ; then 
the retaining body was removed, the two phosphorus cylinders still keeping their 
places ; finally, the magnetic power was brought into action, and immediately the 
moveable cylinder separated slowly from the fixed one and passed to a distance. If 
brought back again whilst the magnet was active, when left at liberty it receded; but 
if restored to close vicinity, when the magnetic force was away, it retained that 
situation. The effect took place either in the one direction or the other, according 
as the fixed cylinder was on this or that side of the moving one ; but the motion was 
in both cases across the lines of magnetic force, and was indeed mechanically and 
purposely limited to that direction by the mode of suspension. When two bismuth 
balls were placed, in respect of each other, in the direction of the magnetic axis, so 
that one might move, but only in the direction of that axis, its place was not sensibly 
affected by the other ; the tendency of the free one to go to the middle of the field 
(2812.) overpowered any other tendency that might really exist. 
2816. Thus two diamagnetic bodies, when in the magnetic field, do truly affect 
each other; but the result is not opposed in its direction to that of paramagnetic 
bodies, being in both cases a separation of the substances from each other. 
2817- The comparison of the action of para- and diamagnetic bodies on each other, 
was completed by using water as the medium in a field of equal magnetic force, and 
suspending a piece of phosphorus from the torsion balance. When the magnetic 
power was on, this phosphorus was repelled equatorially, as before, by another piece 
of phosphorus, but it was attracted by a tube filled with a saturated solution of proto- 
sulphate of iron ; so paramagnetic and diamagnetic bodies attract each other equato- 
rially in a mean medium, but each repels bodies of its own kind (2831.). 
^ ii. Conduction polarity. 
2818. Having thus considered briefly the effects which the disturbance of the lines 
of force, by the presence of paramagnetic and diamagnetic bodies, is competent to 
produce (2807. &c.), I will ask attention to that which may be considered as their 
polarity ; not wishing by the term to indicate any internal condition of the substances 
or their particles, but the condition of the mass as a whole, in respect of the state into 
which it is brought by its own disturbance of the lines of magnetic force ; and that, 
both in regard to its condition with respect to other bodies similarly affected ; and 
also in regard to differences existing in different parts of its own mass. Such a con- 
dition concerns what may be called conduction polarity. Bodies in free space, when 
under magnetic action, will possess it in its simplest condition ; but bodies immersed 
in other media will also possess it under more complicated forms, and its amount 
may then be varied, being reversed or increased, or diminished to a very large extent. 
