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

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.

Human beings are accustomed to think of intellect as the power of having and controlling ideas and of ability to learn as synonymous with ability to have ideas. But learning by having ideas is really one of the rare and isolated events in nature.

Human folk are as a matter of fact eager to find intelligence in animals.

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.

Psychology helps to measure the probability that an aim is attainable.

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