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“Next in order I will proceed to discuss by what law of Nature it
comes to pass that iron can be attracted by that stone which the Greeks
call the Magnet from the name of its native place, because it has its origin
within the bounds of the country of the Magnesians. This stone is more
wondered at because it often produces a chain of [iron] rings hanging
down from it. Thus you may see five and more suspended in succession
and tossing about in the light airs, one always hanging from the other
and attached to its lower side, and each in turn one from the other ex-
periencing the binding power of the stone: with such a continued cur-
rent its force flies through all.

“In things of this kind, many things. must be established before you
can assign the true law of the thing in question, and it must be ap-
proached by a very circuitous road; wherefore all the more I call for an
attentive ear and mind.”——LUCRETIUS, .De Rerum Natura, Lib. VI.,
Munro’s Translation, p. 317.

This lecture is a plain statement of the elementary facts of magnet-
ism, of one magnetic theory, and of the methods to be pursued in master-
ing both. It has already circulated among the teachers mentioned on its
title-page, and I had some doubts as to the propriety of its insertion
here. But, on reading it, it seemed so likely to be helpful, that my

scruples disappeared. J. T.

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