The un-conscious distortion of the facts is almost harmless compared to the unconscious neglect of an animal's mental life until it verges on the unusual and marvelous.

On the whole, the psychological work of the last quarter of the nineteenth century emphasized the study of consciousness to the neglect of the total life of intellect and character.

So the animal finally performs in that situation only the fitting act.

Nowhere more truly than in his mental capacities is man a part of nature.

This growth in the number, speed of formation, permanence, delicacy and complexity of associations possible for an animal reaches its acme in the case of man.

The restriction of studies of human intellect and character to studies of conscious states was not without influence on a scientific studies of animal psychology.