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.

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

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.

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.

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.