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Preformationism was a theory of embryological development used in the late seventeenth through the late eighteenth centuries. This theory held that…
OvaSpermAristotle's On the Generation of Animals is referred to in Latin as De Generatione animalium. As with many of Aristotle's writings, the exact date of…
LiteratureReproductionPublicationsphilosophyMarcello Malpighi studied chick embryos with microscopes in Italy during the seventeenth century. Trained as a medical doctor, he was among the first…
MicroscopyHistologyChick EmbryoVictor Albrecht von Haller was an 18th century scientist who did extensive work in the life sciences, including anatomy and physiology, botany, and…
OvumOvaFetusSpermism was one of two models of preformationism, a theory of embryo generation prevalent in the late seventeenth through the end of the eighteenth…
SpermatozoaSpermOvaSir Francis Galton was a British science writer and amateur researcher of the late nineteenth century. He contributed greatly to the fields of…
PeopleGalton, Francis, 1822-1911GeneticsReproductionBiographyNicolaas Hartsoeker, a Dutch astronomer, optics manufacturer, and naturalist, was born 26 March 1656 in Gouda, Netherlands, and died 10 December 1725…
PeopleHartsoeker, Nicolas, 1656-1725SpermatozoaBiographySpermCharles Bonnet was a naturalist and philosopher in the mid eighteenth century. His most important contribution to embryology was the discovery of…
PeopleParthenogenesisBiography