2. Human Duality
To-day we shall first cast a fleeting glance over that part of the human duality which may be found outside the region we had in mind yesterday. Even the most superficial glance over this second portion of the human being can teach us that this portion really presents a picture in a certain respect the opposite of the other one. In the brain and the spinal cord we have the bony formation as the outer circumference, the covering. If we consider the other portion of man's nature, we are surely obliged to say that here we have the bony formation disposed rather more within the organs. And yet this would be only a very superficial observation. We shall be carried deeper into the construction of this other portion of man's nature if, for the moment, we keep the most important systems of organs apart one from another, and compare them, first, outwardly, with what we learned yesterday.