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

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.

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

Just as the science and art of agriculture depend upon chemistry and botany, so the art of education depends upon physiology and psychology.

Colors fade, temples crumble, empires fall, but wise words endure.

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.

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