An adult who ceases after youth to unlearn and relearn his facts and to reconsider his opinions... is a menace to a democratic community.

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.

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

The real difference between a man's scientific judgments about himself and the judgment of others about him is he has added sources of knowledge.

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.

Human education is concerned with certain changes in the intellects, characters and behavior of men, its problems being roughly included under these four topics: Aims, materials, means and methods.