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Updated: May 18, 2025
Had it done no more than give to Protozoa and Protophyta that cell-form which characterizes them had it done no more than entail the cellular composition which is so remarkable a trait of Metazoa and Metaphyta had it done no more than cause the repetition in all visible animals and plants of that primary differentiation of outer from inner which it first wrought in animals and plants invisible to the naked eye; it would have done much towards giving to organisms of all kinds certain leading traits.
And we saw that alike in the vegetal cell and the animal cell there exist analogous distributions: of course with the difference that the innermost part is not inert. Now we have to note that in those aggregates of cells constituting the Metaphyta and Metazoa, analogous distributions also exist.
It is that this universal trait of the Metazoa and Metaphyta, must be ascribed to the primitive action and re-action between the organism and its medium.
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