Bayen, Pierre

Bayen, Pierre, Opuscules chimiques, A.-J. Dugour and Durand, Paris, an... 

Baume, Antoine. A Manual of Chemistry (translated from second edition of Manuel de Chymie) (Warrington printed by W. Eyres for J. Johnson, 1778). Bayen, Pierre. Essai d experiences cymiques, faites sur quelques precipites de mercure, dans la vue de decouvrir leur nature. Observations 3,1774, 280-295. Beguin, Jean. Les Elemens de Chymie, second French edition (Geneva Jean Celerier, 1624). 

In April 1774, there appeared in Abbe Rozier s Journal de Physique a remaikable paper by Pierre Bayen, a pharmacist who later became a medical inspector in the armies of the French Republic. In discussing his experiments with mercuric oxide, Bayen stated that, when mercury is... 

Pierre Bayen prepares oxygen by heating mercuric oxide. 

Then a French pharmacist named Pierre Bayen pointed out to Lavoisier that calx of mercur) , which we would now call mercuric oxide, can be converted to mercury simply by heating, without the need for phlogiston-rich charcoal. Moreover, the gas released in this process was not Black s fixed air, but something quite different. What was this gas That started to become clear to Lavoisier when Joseph Priestley came to dinner. 

Pierre Bayen, Essai d experiences chymiques, faites sur quelques precipites de mercure, dans la vue de decouvrir leur nature, Observations 3,... 

It was at this point, in October 1774, that Priestley visited Lavoisier and described the remarkable air he had obtained from mercury calx some two months previously. As we have seen (Chapter 4), Priestley was surprised with the result of his experiment, but Lavoisier was already convinced that a gaseous material was removed when a calx was reduced to the metal. Even before Priestley performed his experiment, Lavoisier s compatriot, Pierre Bayen (1725-1798), had shown that charcoal was unnecessary for the reduction of mercury calx strong heat alone was... 

Pierre Bayen (ChMons-sur-Marne, 1725-Paris, 15 February 1798), a pharmacist in the French army (Apothicaire-Major des Camps et Armees du Roi), friend of Rouelle and Venel and pupil of the former and of Pierron de Chamousset (1717-73), was a man of great modesty and in consequence was far from well off. During the Terror he burnt his manuscripts. ... 

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