ABSTRACT
Some will perhaps allege that the animal has free images during its dreams. That at least the higher animals dream seems very probable, although it will never be possible to prove this. The movements they make in their sleep, and the sounds they utter, resemble too much some characteristic movements and sounds of their waking life to be ascribed to accident or to casual reflexes of their body. Yet, the dream-life of animals is so vague that it cannot give us any positive information respecting the images that pass through their mind at such moments and cannot even be regarded as a proof that any experiences really approximating to their dream-images actually occur in such supposed dreams. As proof of the existence of such imagery in the animals their dreams are of little value. That animals do not form concepts, even such concrete and vital concepts as "food" or "water," as "mate" or "enemy," may be regarded as indubitable.
