The development of the meaning attaching to the personal self, the conscious being, is the subject matter of the history of psychology.
The dualism itself becomes a sort of presupposition or datum; its terms condition the further problem.
In the first place, Descartes stands for the most explicit and uncompromising dualism between mind and matter.
Heredity provides for the modification of its own machinery.
The fact that tradition hinders the individual savage from thinking logically by no means proves that he cannot think logically.