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

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

When, instead of merely associating some act with some situation in the animal way, we think the situation out, we have a set of particular feelings of its elements.

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

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

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

The dog, on the other hand, has few or no ideas because his brain acts in coarse fashion and because there are few connections with each single process.