Lecture III

The other stream, that of forces continuously giving life, works in the muscle and blood system and in all that is connected with it. The only reason why nerves are not bones is that their connection with the blood and muscle system is such that the impulse in them to become bone is directly opposed by the forces working in the blood and muscle. The nerve does not become bone solely because the blood and muscle system stands over against it and hinders it from becoming bone. If during the process of growth bone develops a wrong relationship to blood and muscle, then the condition of rickets will result, which is due to the muscle and blood nature hindering a proper deadening of the bone. It is therefore of the utmost importance that the right alternation should come about in man between the muscle and blood system on the one hand and the bone and nerve system on the other. The bone nerve system extends into the eye, but in the outer covering the bone system withdraws, and sends into the eye only its weakened form, the nerve; this enables the eye to unite the will nature, which lives in muscles and blood, with the activity of mental picturing. Here again we come upon something which played an important role in ancient science, but which is scorned as a childish conception by the science of to-day. But modern science will come back to it again, only in another form.