Note 2 — Chapter VIII · ESSAY ON THE HUMAN UNDERSTANDING.
Reading edition
Sir W. Hamilton refers to La Chambre (Système de l'Ame: Paris, 1664) as having anticipated Locke in the use of this expression. In Liv. IV., ch. ii., art. 9, La Chambre speaks of "l' Union et la Liaison des Images," but I cannot find that he approaches any nearer to the now established phraseology.