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Updated: May 1, 2025
Minor qualifications being admitted, there remain the broad general facts, that out of that part of the external layer which remains permanently external, are developed all the structures which carry on intercourse with the medium and its contents, active and passive; out of the introverted part of this external layer, are developed the structures which carry on intercourse with the quasi-external substances that are taken into the interior solid food, water, and air; while out of the mesoblast are developed structures which have never had, from first to last, any intercourse with the environment.
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