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<title> SUMMARY </title>Amedeo Avogadro is one of the most mentioned scientists in chemistry handbooks. But, strange to say, the evolution of his scientific thought is still unknown to many historians. Traditional historiography sees the basic Avogadro's law, «under the same physical conditions equal volumes of gases contain the same number of particles», in the context of John Dalton's atomic theory. On the contrary, the analysis of Avogadro's first works suggests new elements for a different and correct interpretation. It's an original perspective that shows how much the piedmontese scientist owes to the French physics of the first part of the 19th century, but, above all, his unusual way of being scientist.The manuscript entitled Considération sur la nature des substances connues sous le nom de sels métalliques et sur l'ordre de combinaisons auquel il parait le plus convenable de les rapporter, which was presented before the Academy of Sciences in Turin on the 6th of December 1804, is absolutely unpublished. Avogadro's second work from a chronological point of view, but the first one to deal with a chemical subject, the manuscript is written in a fairly clear handwriting. The text has been exactly reproduced without any alteration to the original draft.

Affiliations: 1: Firenze


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