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.

Dogs get lost hundreds of times and no one ever notices it or sends an account of it to a scientific magazine.

To the intelligent man with an interest in human nature it must often appear strange that so much of the energy of the scientific world has been spent on the study of the body and so little on the study of the mind.

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

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

Whatever exists at all exists in some amount. To know it thoroughly involves knowing its quantity as well as its quality.

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.