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Negative evidence is confirmed by the abundance of positive.When we move from these proteolytic lumps of mucus to living organismswith a constant distribution of matter, we find the difference in the tissuescorresponding to the difference in relative position. Higher Protozoa,as Protophyta, the main differentiation occurs at the cellularthe shell and the contents of the cells, respectively the main oppositesconditions, namely, in terms of both internal and external. Moving fromorganisms belonging to the class of one-celled organisms to the lowest ofcompiled by a combination of cells, we note everywhere the relationship between the difference indevice and the difference in surrounding circumstances. The lack of a definiteorganization in sponges, leaking everywhere jet of seawater corresponds tothe absence of a specific difference in the terms. At the Thalassicolla of ProfessorHuxley - a transparent, colourless body, floating passively on the sea surfaceand consisting mainly of "mass of cells United by mucus", -noticed a rude structure obviously subordinated to the primary relations of centreto the surface: when all the many and substantial variations in theirparts are then more or less concentric arrangement.
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