Lecture XVIII

It will therefore also be readily understood that the whole etheric body, containing the forces of growth in man, must work differently in childhood and in maturity. In childhood, the etheric body must intervene much more in the physical functions; and must have organs as its direct points of attack, so to say. It is especially necessary in the foetal stage that the etheric body should have these points for direct working upon the physical; but the need persists in early childhood, when there is not only organic formation, but growth as well, and during growth the plastic activity must be exercised. Hence the need for organs such as the thymus gland, for instance (and even to some extent the thyroid as well); these have their greatest task in childhood, and then enter on a phase of regression, and if too much seized upon by the physical forces, degenerate during the retrogressive phase. During childhood, there must of necessity be a powerful chemism at work within the body, which is replaced, at a later stage, by the working of warmth. One might say that during the life of the individual, man passes through something of which the prismatic spectrum is a symbol: inasmuch as we observe the more strongly chemical extremity (blue and violet), and then the luminous portion (green and yellow), finally the other extremity, connected with heat (red). For man experiences constitutional changes of this nature and in this direction. (see Diagram 27). During childhood, the human being is more dependent on activities working chemically, then passes on to those which act through light, and those acting through warmth. The organs which enable the etheric body to promote the chemism in the physical body, are such glands as the thyroid and thymus. On the activity of these organs (to which in a certain sense the chemism is bound) there also depends the particular individual complexion and skin colouring—that is to say, on the etheric activity behind the physical organs. Among the functional offices of the adrenal glands is the determination of the complexion, and if the adrenals degenerate there must be changes in pigmentation in consequence. As an example you need only consider what is known as Addison's Disease, arising from degenerative conditions in the adrenal glands—when the whole skin becomes brown. All this strongly indicates a certain chemism in the human organism. It is at work more especially in the foetus, while the action of light has more importance after approximately fourteen years of age. And then appear the activities connected with the life of warmth. Here we have a most significant indication and gauge for the whole course of human life. The period of childhood, and before birth, especially the latter, the foetal stage, represents a certain predominance of the salt-process; early middle life is predominantly a mercurial process and later life and old age, in the relation referred to, represent a kind of sulphur process. This implies that in childhood most attention should be paid to the salt-process, in middle life to the mercurial, and in later life to the sulphuric or phosphoric, and these require regulation. Here again, if you realise this triad of organising chemism—organised light process, organised mercurial process and organised saline process at work in the human organism, you will gain a conception of the manner in which the whole of life works on man, organising him. The manner of life—not only the diet, but the whole habit and action of life—operates chemically on the child, impinging strongly upon the organism; the even more strong light process has such a great influence on the very young, that it sows a seed that may even manifest in disorders of the soul. In youth, man is most sensitively receptive to all the impressions of the external world. Whether at this stage of life we encounter an external world formed regardless of reason and logic, or one which is formed according to reason and logic, has a great significance for the whole constitution of the soul in later life. We shall go further into this in the next lecture, passing from the pathological aspects just considered, to the therapeutic.