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A preformationist who believed that the female sex cell contained a miniature body susceptible to growth when stimulated by semen. Compare: spermist.
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Ovists, including Marcello Malpighi and Jan Swammerdam, argued that a miniature human was housed within each female egg (then recently described by William Harvey); spermists such as Antoni van Leeuwenhoek and Nicolas Hartsoeker argued that each sperm contained little people, or homunculi.
Pinto-Correia avoids a chronological account of the development of preformation, rather structuring the book around each of the challenges to preformation in general, illustrating how ovists and spermists responded differently.