‎"LAURENT, AUGUSTE.‎
‎Sur les Acides Pimarique, Pyromarique, Azomarique, etc. (+) Sur les divers Nitrites et chlorure Anthrocéniques. (2 Papers).‎

‎(Paris, Crochard, 1839) No wrappers. In: ""Annales de Chimie et de Physique, Par MM. Gay-Lussac et Arago."", tome 72, Cahier 4. Pp. 337-445 (entire issue offered). Laurent's papers: pp. 383-415 and pp. 415-427. With general titlepage to volume 72.‎

Reference : 45008

‎First printing of two importent papers on organic chemistry in which Laurent used halogens systematically, and these led him to distinguish two types of reactions, (equivalent) substitutions and additions, and to develop his nucleus theory. ""A founder of modern organic chemistry, Laurent was one of the most important chemists of the nineteenth century. He considered the behavior of matter to be a manifestation of its intimate internal structure, which one cannot determine with certainty but which one has to investigate if one wants to understand. Laurent’s preoccupation was to construct a method that could guide the chemist forward along this path, from facts to their causes. He was the first chemist to intimately associate crystallo-graphic data and chemical studies. Louis Pasteur and Charles Friedel later followed the way.""(DSB).‎