The prehistorical and primitive period represents the true infancy of the mind.

The fact that tradition hinders the individual savage from thinking logically by no means proves that he cannot think logically.

In the first place, Descartes stands for the most explicit and uncompromising dualism between mind and matter.

In Socrates' thought the two marks of individual self-consciousness appear; it is practical and it is social.

The reason of the close concurrence between the individuals progress and that of the race appears, therefore, when we remember the dependence of each upon the other.

The dualism itself becomes a sort of presupposition or datum; its terms condition the further problem.

The prehistorical and primitive period represents the true infancy of the mind.