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Rh for among gregarious animals the life of instinct includes the group. The impulses which it includes may not in fact make for success, and may often in fact militate against it, but are nevertheless those of which success is the raison d'être, those which express the animal nature of man and his position among a world of competitors.

The life of the mind is the life of pursuit of knowledge, from mere childish curiosity up to the greatest efforts of thought. Curiosity exists in animals, and serves an obvious biological purpose; but it is only in men that it passes beyond the investigation of particular objects which may be edible or poisonous, friendly or hostile. Curiosity is the primary impulse out of which the whole edifice of scientific knowledge has grown. Knowledge has been found so useful that most actual acquisition of it is no longer prompted by curiosity; innumerable other motives now contribute to foster the intellectual life. Nevertheless, direct love of knowledge and dislike of error still play a very large part, especially with those who are most successful in learning. No man acquires much knowledge unless the acquisition is in itself delightful to him, apart from any consciousness