Amongst the minds of animals that of man leads, not as a demigod from another planet, but as a king from the same race.

Psychology is the science of the intellects, characters and behavior of animals including man.

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

The intellectual evolution of the race consists in an increase in the number, delicacy, complexity, permanence and speed of formation of such associations.

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

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.