Note 2 — CANTO XVIII.
Charles Eliot Norton translation
Form is here used in its scholastic meaning. “ The active power of anything depends on its form, which is the principle of its action. Fur the form is either the nature itself of the thing, as in those which are pure form; or it is a constituent of the nature of the thing, as in those which are composed of matter and form.”—Summa Theol., 3, xiii. i. Fire by its form, or nature, seeks the sphere of fire between the ether and the moon.