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It is only with these facts of katagenetic order that physico-chemistry deals that is, in short, with the dead and not with the living. The other kind of facts certainly seem to defy physico-chemical analysis, even if they are not anagenetic in the proper sense of the word.
One of the most notable naturalists of our time has insisted on the opposition of two orders of phenomena observed in living tissues, anagenesis and katagenesis. The rôle of the anagenetic energies is to raise the inferior energies to their own level by assimilating inorganic substances. They construct the tissues.
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