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The needs of the organism influence structure. The spines in the quills in the tails of woodpeckers, and in the brown creeper, are other cases in point. The nuthatch has no spines on its tail, because it can move in all directions, as well with head down as with head up. I have read of a serpent somewhere that feeds upon eggs.
When the full import of this history is realized, and when we look further into the nature of these preliminary conditions through which the human organism passes in development, we are forcibly impressed by other facts than the one to which I have directed your attention, for not only do we find natural transformation, as in the other mammals, but the embryonic stages are marvelously similar to the earlier conditions in other mammals.
In any case each fresh habit taking root in the organism forms a little mainspring or instinct of its own, like a parasite; so that an elaborate mechanism is gradually developed, where each lever and spring holds the other down, and all hold the mainspring down together, allowing it to unwind itself only very gradually, and meantime keeping the whole clock ticking and revolving, and causing the smooth outer face which it turns to the world, so clean and innocent, to mark the time of day amiably for the passer-by.
It is easy to understand the nature of this disease when we remember the great number of bacteria in milk, especially in hot weather, and when we remember that the delicate organism of the infant will be thrown at once into disorder by slight amounts of poison which would have no appreciable effect upon the stronger adult.
Nevertheless, Bichat rendered a solid service to physiological progress by insisting upon the fact that what we call life, in one of the higher animals, is not an indivisible unitary archaeus dominating, from its central seat, the parts of the organism, but a compound result of the synthesis of the separate lives of those parts.
'These are the folk! These are the basis of society, and the fountain of our wealth and luxury! I thought; for I was just beginning, at that period, to be interested in the disquieting aspects of the social organism, and my ideas were hot and crude.
The forces at play in this drama are, first, the primary impulses and functions represented by elementary values; second, the thin network of signals and responses by which those functions are woven into a total organ, represented by discursive thought and all secondary mental figments, and, third, the equilibrium and total power of that new organism in action represented by the ideal.
Maternity was no doubt the supreme function of primitive woman, the one end to which her whole organism tended; but the law of increasing complexity had operated in both sexes, and he had not seriously supposed that, outside the world of Christmas fiction and anecdotic art, such truisms had any special hold on the feminine imagination.
This points to the possession by the human organism of an 'inner' light which first forms the eye from within, in order that it may afterwards meet the light outside. It is this inner light that Goethe makes the starting-point of his investigations, and it is for this reason that he treats physiological colours before physical colours.
What is its historical basis? Is it possible to trace the process by which it has emerged? In the history of every conscious organism, a race, a State, or an individual, there is a certain moment when the Unconscious desire, purpose, or ideal passes into the Conscious. Life's end is then manifest. The ideal unsuspected hitherto, or dimly discerned, now becomes the fixed law of existence.
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