26 DR. FARADAY’S EXPERIMENTAL RESEARCHES IN ELECTRICITY. (SERIES XX.) 
ertion of the action of all the particles brings the mass into the position, which, by 
experiment, is found to belong to it. 
22/0. When one or two magnetic poles are active at once, the courses described 
by particles of heavy glass free to move, form a set of lines or curves, which I may 
have occasion hereafter to refer to ; and as I have called air, glass, water, &c. diamag- 
netics (2149.), so I will distinguish these lines by the term diamagnetic curves , both 
in relation to, and contradistinction from, the lines called magnetic curves. 
2271. When the bar of heavy glass is immersed in water, alcohol, or ether, con- 
tained in a vessel between the poles, all the preceding effects occur ; the bar points and 
the cube recedes exactly in the same manner as in air. 
2272. The effects equally occur in vessels of wood, stone, earth, copper, lead, silver, 
or any of those substances which belong to the diamagnetic class (2149.). 
2273. I have obtained the same equatorial direction and motions of the heavy glass 
bar as those just described, but in a very feeble degree, by the use of a good common 
steel horse-shoe magnet (2157-)- I have not obtained them by the use of the helices 
(2191. 2192.) without the iron cores. 
2274. Here therefore we have magnetic repulsion without polarity, i. e. without 
reference to a particular pole of the magnet, for either pole will repel the substance, 
and both poles will repel it at once (2262.). The heavy glass, though subject to 
magnetic action, cannot be considered as magnetic, in the usual acceptation of that 
term, or as iron, nickel, cobalt, and their compounds. It presents to us, under these 
circumstances, a magnetic property new to our knowledge ; and though the pheno- 
mena are very different in their nature and character to those presented by the action 
of the heavy glass on light (2152.), still they appear to be dependent on, or connected 
with, the same condition of the glass as made it then effective, and therefore, with 
those phenomena, prove the reality of this new condition. 
®[[ iii. Action of magnets on other substances acting magnetically on light. 
2275. We may now pass from heavy glass to the examination of the other sub- 
stances, which, when under the power of magnetic or electric forces, are able to 
affect and rotate a polarized ray (2173.), and may also easily extend the investigation 
to bodies which, from their irregularity of form, imperfect transparency, or actual 
opacity, could not be examined by a polarized ray, for here we have no difficulty in 
the application of the test to all such substances. 
2276. The property of being thus repelled and affected by magnetic poles, was soon 
found not to be peculiar to heavy glass. Borate of lead, flint-glass, and crown-glass 
set in the same manner equatorially, and were repelled when near to the poles, 
though not to the same degree as the heavy glass. 
2277- Amongst substances which could not be subjected to the examination by 
light, phosphorus in the form of a cylinder presented the phenomena very well ; I 
think as powerfully as heavy glass, if not more so. A cylinder of sulphur, and a long 
