(Paris, Imprimerie Royale, 1755). 4to. Extract from ""Mémoires de Mathematique et de Physique, Présentés à l'Academie des Sciences par divers Savans"", Tome II. Pp. 412-434.
First printing of one of the 2 papers in which baron finally settled the composition of Borax. He showed that Borax is formed by the combination of soda with the substance (boric acid) previously called se sédatif.