242 Dr. Faraday on Magnetic and Diamagnetic Action. 
to suggest that probably the lateral action of electrical currents 
which is equivalent to electrodynamic or magnetic action, was 
also conveyed onwards in asimilar manner. At that time I could 
discover no peculiar condition of the intervening or diamagnetic 
matter; but now that we are able to distinguish such an action, 
so like in its nature in bodies so uniéke in theirs, and. by that ‘so 
hike im character to the manner in which the magnetic force per- 
vades all kinds of bodies, being at the same time as universal in its 
presence as it is in its action; now that diamagnetics are shown 
not to be indifferent bodies, I feel still more confidence in repeat-. 
ing the same suggestion, and asking whether it may not be by 
the action of the contiguous or next succeeding particles that the 
magnetic force is carried onwards, and whether the peculiar con- 
dition acquired by diamagnetics when subject to magnetic action, 
is not that condition At which rome pees of the force is 
affected ? 
2444, Jap salosiies view we tadoee a. solid. ind rea ccnesii 
whether as forming two lists, or one great magnetic class (2424, 
2437), it will not, as far as Ecan perceive, affect the question. 
They are all subject to the influence of the magnetic lines of 
force passing through them, and the virtual difference in property 
and character between any two substances taken from different 
places in the list (2424,) will be the same ; for it is the differen~ 
tial relation of the two which governs their mutual effects. 
2445. It is that group which includes air, gases, vapours, and 
even a vacuum which presents any difficulty to the mind; but 
here there is such a wonderful change in the physical constitu- 
tion of the bodies, and such high powers in some respects are re- 
tained by them, whilst others seem to vanish, that we might al- 
most expect some peculiar condition to be assumed in regard. to 
a power so universal as the magnetic force. Electric induction 
being an action through distance, is varied enough amongst solid 
and liquid bodies; but, when it comes to be exerted in air or 
gases, where it most manifestly exists, it is alike in amount in 
all; neither does it vary in degree in air however rare or dense 
it may be. Now magnetic action may be considered as a mere 
function of electric force, and. if it should be found to correspond 
with the latter in this’ particular relation to air, gases, ¢ _ it 
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