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Microscopic views of human spermatozoa in semenMicroscopic views of human spermatozoa. View of the animalculae or organic particles in the semen. Handcoloured copperplate engraving by J
Changeable cercaria, Cercaria mutabilis.. Handcolored copperplate zoological engraving from George Shaw and Frederick Nodders The Naturalists Miscellany, 1792