Abstract
The debate between to be and to become that opposed Parmenides and Heraclitus became converted, over the subsequent two millennia, into the dilemmas between preformation and epigenesis, and between immanence and transcendence. Aristotle, enunciating his Theoria generationis, moved the controversy from the realm of Metaphysics to Physics and can even be glimpsed trespassing into Biology in Harvey’s treatises De Motu Cordis and Exercitatione de Generatione Animalium which introduced the concept of ovism. In the same period, the spermatozoon (animalculum) was described, and ovism and animaculism became counterparts. The two theories could be read on the background of preformation or epigenesis. With the Enlightenment, the dispute over the processes of development was exposed to Cartesian rationalism and subjected to severe experimentation. Comte’s positivism led to the search for the material first causes of development, according to the laws of Physics and Chemistry, whereas Roux’s Entwicklungsmechanick ruled developmental biology during the nineteenth century until the middle of the last century when Crick and Watson published their research, finally resolving the millenary conflict between preformation and epigenesis in molecular and genetics terms.
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Notes
See the Italian edition of the complete works of Lazzaro Spallanzani, edited by Pericle Di Pietro, volume II of the Letters (Correspondence with Charles Bonnet) Modena 1984 Mucchi Ed.
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The author wishes to thank his colleagues Carlo Redi and Manuela Monti for the suggestions and criticisms, and Rachel Stenner for the English language revision.
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Opening lecture held on June 12, 2017 at the 63rd Meeting of the Italian Embryology Group (G.E.I.).
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Capanna, E. Theoria Generationis: the ancient roots of modern developmental biology. Rend. Fis. Acc. Lincei 29, 1–12 (2018). https://doi.org/10.1007/s12210-018-0674-y
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DOI: https://doi.org/10.1007/s12210-018-0674-y