Part 2 / Book 5 — Book V
Reading edition
In this Fifth Book is to be found everything relative to the dip of the magnetic needle, likewise the description of an instrument for showing, by the action of a loadstone, the degree of dip below the horizon in any latitude; and the announcement that the magnetic force is animate or imitates a soul; in many respects, it surpasses the human soul while that is united to an organic body.