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

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

Some statements concern the conscious states of the animal, what he is to himself as an inner life; others concern his original and acquired ways of response, his behavior, what he is an outside observer

The un-conscious distortion of the facts is almost harmless compared to the unconscious neglect of an animal's mental life until it verges on the unusual and marvelous.

Human folk are as a matter of fact eager to find intelligence in animals.

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

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