Extrait d'un Mémoire sur les Rotations que certaines substances impriment aux axes de polarisation des rayons lumineux.

Paris, Crochard, 1818. No wrappers. In: ""Annales de Chimie et de Physique"", 2me Series - Tome 9, Cahier 4. Pp. 337-444. (Entire issue offered). Biot's paper: pp. 372-396.

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In a paper read to the Academy on 22 September 1818, Biot was able to announce what has become known as Biot’s law of rotatory dispersion. Knowing the specific rotation of a compound, BIOT's law determines the concentration of a solution of that compound. This law is additive, that is to say that the rotatory power of a mixture is the sum of the optical rotations of compounds that constitute the mixture.