T 2.1.12.7

In order to decide this question, let us consider, that there is evidently the same relation of ideas, and deriv'd from the same causes, in the minds of animals as in those of men. A dog, that has hid a bone, often forgets the place; but when brought to it, his thought passes easily to what he formerly conceal'd, by means of the contiguity, which produces a relation among his ideas. In like manner, when he has been heartily beat in any place, he will tremble on his approach to it, even tho' he discover no signs of any present danger. The effects of resemblance are not so remarkable; but as that relation makes a considerable ingredient in causation, of which all animals shew so evident a judgment, we may conclude that the three relations of resemblance, contiguity and causation operate in the same manner upon beasts as upon human creatures.