“From the lowest animals of which we can affirm intelligence up to man this type of intellect is found.”
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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.
Psychology is the science of the intellects, characters and behavior of animals including man.
Human folk are as a matter of fact eager to find intelligence in animals.
Human beings are accustomed to think of intellect as the power of having and controlling ideas and of ability to learn as synonymous with ability to have ideas. But learning by having ideas is really one of the rare and isolated events in nature.