ame result was obtained independently, and extended to various
other bodies, magnetic as well as diamagnetic, and also to compressed
substances, a little subsequently by myself.

The law of action in relation to this point is, that in diamagnetic
crystals, the line along which the repulsion is a maximum, sets
equatorially in the magnetic field; while in magnetic crystals the line
along which the attraction is a maximum sets from pole to pole. Faraday
had said that the magne-crystallic force was neither attraction nor
repulsion. Thus far he was right. It was neither taken singly, but it
was both. By the combination of the doctrine of diamagnetic polarity
with these differential attractions and repulsions, and by paying due
regard to the character of the magnetic field, every fact brought
to light in the domain of magne-crystallic action received complete
explanation. The most perplexing of those facts were shown to result
from the action of mechanical couples, which the proved polarity both
of magnetism and diamagnetism brought into play. Indeed the thoroughness
with which the experiments of Faraday were thus explained, is the most
striking possible demonstration of the marvellous precision with which
they were executed.

Footnotes to Chapter 11

[1] See Heat as a Mode of Motion, ninth edition, p. 75.

[2] See Sir Wm. Thomson on Magne-crystallic Action. Phil.
Mag., 1851.

Chapter 12.

Magnetism of flame and gases--atmospheric magnetism

When an experimental result was obtained by Faraday it was instantly
enlarged by his imagination. I am acquainted with no mind whose power
and suddenness of expansion at the touch of new physical truth could be
ranked with his. Sometimes I have compared the action of his experiments
on his mind to that of highly combustible matter thrown into a furnace;
every fresh entry of fact was accompanied by the immediate development
of light and heat. The light, which was intellectual, enabled him to see
far beyond the boundaries of the fact itself, and the heat, which was
emotional, urged him to the conquest of this newly-revealed domain. But
though the force of his imagination was enormous, he bridled it like a
mighty rider, and never permitted his intellect to be overthrown.

In virtue of the expansive power which his vivid imagination conferred
upon him, he rose from the smallest beginnings to the grandest ends.
Having heard from Zantedeschi that Bancalari h