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In page Spontaneous generation:

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Where Aristotle held that the embryo was formed by a coagulation in the uterus, William Harvey (1578–1657) by way of dissection of deer, showed that there was no visible embryo during the first month.[3] Although his work predated the microscope, this led him to suggest that life came from invisible eggs. In the frontispiece of his book Exercitationes de Generatione Animalium (Essays on the Generation of Animals), he made an expression of biogenesis: "omnia ex ovo" (everything from eggs).[4]