We will admit that, out of the mud or sand which is found on the seashore or the beds of our rivers, at low water, shellfish or testaceous animals come forth, but it does not from thence by any means follow that they are produced without any regular course of generation.

Antonie van Leeuwenhoek

Admit Animals Any Beds Come Course Does Follow Forth Found Generation Low Means Mud Our Out Produced Regular Rivers Sand Seashore Water Which Will Without

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For my part, I hold it equally impossible for a small shellfish to be produced without generation as for a whale to have its origin from the mud.

— Antonie van Leeuwenhoek

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Life lives on life - it is cruel, but it is God's will. And it is for our good, of course, because if there weren't little animals to eat up the young mussels, our canals would be choked by those shellfish, for each mother has more than a thousand young ones at a time!

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I have often endeavoured to view the circulation of the blood in terrestrial animals, but without success, by reason that no parts of their bodies were sufficiently transparent.

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Man comes not from an egg but from an animalcule that is found in male sperm.

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In the year of 1657 I discovered very small living creatures in rain water.

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