This is in no way to deny the close connection of psychic happenings with the physiological structure of the brain, with the glands, and the body in general. We are once for all deeply convinced of the fact that the contents of consciousness are to a large part determined by our sense-perceptions. We cannot fail to recognize that unalterable characteristics of a physical as well as a psychic nature are unconsciously ingrained in us by heredity, and we are deeply struck by the power of the instincts which inhibit or reinforce or otherwise modify our mental capacities.
