2. Human Duality

Let us now briefly recall that the human heart is an organ which, properly speaking, consists in the first place of four parts or chambers, so separated by interior walls that one can distinguish between the two larger spaces lying below and the two smaller ones lying above, the two lower ones being the ventricles, as they are generally called, and the two upper ones the auricles. I shall not speak about the “valves” to-day, but shall rather call attention, quite sketchily, to the course of the most important organic activities. And here, to begin with, one thing is clear: after the blood has streamed out of the left auricle into the left ventricle, it flows off through a large artery and from this point is conducted through the entire remainder of the organism. Now, let us bear in mind that this blood is first distributed to every separate organ of the whole organism; that it is then used up in this organism so that it is changed into the so-called blue blood, and as such returns to the right auricle of the heart; and that from there it flows into the right ventricle in order that it may go out again from this into the lungs, there again to be renewed and take a fresh course throughout the organism.