Note 123 — Chapter V · EVOLUTION OF THE PRINCIPAL CONCEPTS.

Romanes gives some examples of what he terms appreciation of causality in animals, including that of a setter that was frightened at thunder. “On one occasion a number of apples were being shot out of bags upon the wooden floor of an apple room, the sound in the house as each bag was shot closely resembled that of distant thunder. The setter therefore became terribly alarmed; but when I took him to the apple-room and showed him the real cause of the noise, his dread entirely forsook him, and on again returning to the house he listened to the rumbling with all cheerfulness.” Other analogous cases are to be found in his Mental Evolution in Animals, Chap. X.