CHAP. XX.

*

An armed Loadstone raises an armed Loadstone,

_which also attracts a third; which likewise_

happens, though the virtue in the first

_be somewhat small_.

Magnets armed cohære firmly when duly joined, and accord into one; and

though the first be rather weak, yet the second one adhæres to it not only

by the strength of the first, but of the second, which mutually give

helping hands; also to the second a third often adheres and in the case of

robust stones, a fourth to the third.

* * * * *

{89}

On the magnet, magnetick bodies also, and on the great magnet the earth a new physiology, demonstrated by many arguments & experiments · 第 39 / 110 题