Desmarest’s “Determination of some epochs of nature through volcanic products” (1775/1779)

Abstract

10. Desmarest attended Rouelle's course of lectures in chemistry in Paris (which were not oriented toward mining concerns) in the early 1760s.Although no evidence is known to show that Desmarest met Arduino during his Italian journey of 1765-1766, it seems likely that he learned about him no later than that time.Surely he must also have been aware, by 1775, of Lehmann's work, which was translated into French by d'Holbach in 1759.11.In his later and fuller republication of his paper on Auvergne époques (read at the Institut de France in 1804, printed 1806), Desmarest accepted a reversal of the 'analytical order', and adopted the emerging convention of designating periods in chronological order.Among the most conspicuous differences between the 1779 excerpt and this later republication, the 1806 article included place-specific commentary illustrating the époques' distinctions in Auvergne, with four maps; and it elaborated on the application of his 'theory of époques' to localities other than Auvergne, especially in Italy.12. See for instance Desmarest 1794-1828, articles 'Analyse du globe de la terre', vol. 2 (1803), pp.493-497; and 'Méthode d'observation pour la distinction des époques de la nature', vol.

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