Nouveaux Essais sur l’Entendement Humain—Avant-propos. (Œuvres, Paris ed., 1842, vol. i., p. 19.)

This doctrine also was accepted as true, and conclusions were grounded on it, by Sir William Hamilton. See Examination, chap. xxiv.

Not that of Leibnitz, but the principle commonly appealed to under that name by mathematicians.

Dissertation, p. 27.

Hist. Ind. Sc., Book i., chap. i.

Novum Organum, Aph. 75.