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‎Recherches chimiques sur l'Hellénine. (+) Sur la Constitution des Sels organiques à Acides complexes, et leurs Rapports avec les Sels ammoniacaux. (2 Papers).‎

‎(Paris, Crochard, 1839) No wrappers. In: ""Annales de Chimie et de Physique, Par MM. Gay-Lussac et Arago."", tome 72, Cahier 2. Pp. 113-224 (the entire issue offered). Gerhardt's papers: pp. 163-183 and pp. 184-215.‎

‎First printing of two importent papers, the first paper is Gerhardt's first work, having the same subject as his doctoral theisis, 1840. The second paperis a classic study in organic chemistry in which Gerhardt breaks with the conceptions of dualism and pre-existing radicals, and sets forth his ""Theory of Residues"". ""A new aspect was given to the substitution-type theory by Gerhardt, who explained the formation of organic compounds as due to ""pairing"" or ""copulation"" of residues.""(Findlay ""A Hundred years of Chemistry"" p. 30 ff).‎