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

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

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

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

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

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.

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