II. The Elemental Kingdoms of Nature

The nerves are the second member. Wherever nerves are found, there the physical, etheric and astral bodies permeate one another. Where glands are to be found, the physical and etheric bodies interpenetrate. All the instruments of the senses, all organs which have the character of a physical apparatus, have reached merely the mineral stage. They follow exactly the same laws as do the minerals. The eye and the ear, for instance, belong to these mineral inclusions; also in the brain, such mineral parts still exist. Thus you can see for yourselves how easily one may be tempted at times to become a materialist—because something that is mineral permeates the whole body. If a materialist declares that the brain is mineral, he is in part right—that is, if he considers merely one part of the brain. Particularly in certain parts of the frontal brain—which are, however, also permeated by other irradiations, solely mineral forces are active. And were we to study the bones and muscles, it would become still more complex. When the human Ego entered into man, it began to devise the sentient soul, the rational soul, and the consciousness soul; and at the same time, it worked out the bones and muscles. If we wish to observe these things exactly, we need years of study, only to be able to keep them distinct and separate. We must trace one thing after the other, with patience.