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

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.

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.

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

It will of course, be understood that directly or indirectly, soon or late, every advance in the sciences of human nature will contribute to our success in controlling human nature and changing it to the advantage of the common wheel.

Nowhere more truly than in his mental capacities is man a part of nature.