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

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.

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

All that exists, exists in some amount and can be measured.

He who learns and runs away, lives to learn another day.

For origin and development of human faculty we must look to these processes of association in lower animals.