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

From the lowest animals of which we can affirm intelligence up to man this type of intellect is found.

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.

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.

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

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