Johann Chrysostom Magnenus
Johann Chrysostom Magnenus (French Jean Chrysostôme Magnen, c. 1590 – c. 1679[1]) was a physician and advocate of atomism.
He was born at Luxeuil in Burgundy.[2] He took a medical degree at the University of Dôle.[3]
He joined the medical faculty at the University of Pavia, where he published his scientific work Democritus reviviscens in 1646. He cited Daniel Sennert, but his ideas were distinct from Sennert's and those of Democritus. He considered that atoms were the indivisible parts of three of the classical elements: earth, water and fire.[4]
In 1646, Magnenus estimated the number of atoms contained in a piece of incense from an argument based on the sense of smell (if a fraction of the grain is burned, the number of particles can be estimated from the volume within which the scent is still perceptible).[5] His estimate for the number of particles in a piece of incense "not larger than a pea" was of the order of 1018. This estimate is remarkably accurate, within about three orders of magnitude of the true value (based on the number of molecules in the unburned incense) and thus only one order of magnitude off in linear dimension of the molecule.[6] Magnenus was by far the earliest scholar to give a reasonable estimate for the size of a molecule; the first "modern" estimate was given more than 200 years later, in 1865, by Josef Loschmidt.[7]
His other writings include De tabaco (1648), on the medical usage and effects of tobacco, and De manna liber singularis (1648). He apparently prescribed tobacco syrup as a standard remedy for his patients.
References
- ^ These are the dates given in Dictionary of Scientific Biography; Güsgens (1910) estimated his birth at close to 1600 and his death close to 1670.
- ^ "The Galileo Project". galileo.rice.edu. Retrieved 2018-11-20.
- ^ Francesco Bottin, Models of the History of Philosophy: From its origins in the Renaissance to the "historia philosophica" (1993), pp. 133–4; Google Books.
- ^ Daniel Garber, Michael Ayers (editors), The Cambridge History of Seventeenth-century Philosophy, Volume 1 (2003), p. 556; Google Books.
- ^ "The Concept of Law and Models in Chemistry". cambridge.org. Retrieved 2019-06-20., citing Alfred Stückelberger, Antike Atomphysik (1979) and Democritus Reviviscens: Sive Vita et Philosophia Democriti (1658), Disputatio II, Caput III (De Atomorum Proprietatibus), p. 207 (fuissent in hoc thuris grano, pisi magnitudinem non superante, atomi elementales ad minimum 777 600 000 000 000 000, ex quibus patet quantae sit parvitatis atomus una, concjicique potest, quantus sit atomorum numerus in toto universo).
- ^ "only about one order of magnitude short regarding the length of an incense molecule" Klaus Ruedenberg, W. H. Eugen Schwarz, Three Millennia of Atoms and Molecules (2013), Chapter 1, pp. 1–45, doi:10.1021/bk-2013-1122.ch001.
- ^ Loschmidt, J. (1865). "Zur Grösse der Luftmoleküle". Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften Wien. 52 (2): 395–413.
- J. Güsgens, Die Naturphilosophie des Johannes Chryostomos Magnenus, Bonn, 1910.
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