And now, finally, we must consider that peculiarity of the totemic system which attracts the interest of the psychoanalyst. Almost everywhere the totem prevails there also exists the law that the members of the same totem are not allowed to enter into sexual relations with each other; that is, that they cannot marry each other. This represents the exogamy which is associated with the totem. This sternly maintained prohibition is very remarkable. There is nothing to account for it in anything that we have hitherto learned from the conception of the totem or from any of its attributes; that is,...