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

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

From the lowest animals of which we can affirm intelligence up to man this type of intellect is found.

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.

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

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

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