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Leçons de Chimie


THE general plan of the second edition of this work does not differ essentially from that of its predecessor. The introductory portion on generalities—dealing with states of aggregation, laws of combination, equivalents and atomic weights, physical and chemical transformation, chemical equilibrium, the velocity of reaction, thermochemistry, &c.—has been recast, and now occupies one-fifth of the volume. In the descriptive portion, which is concerned with inorganic chemistry only, Moissan's work on fluorine, the diamond, and boron has been introduced. It is characteristic of a French text-book that even now it is deemed necessary to print alongside each important atomic equation the corresponding equation based on equivalents. In the same connection it will be somewhat disconcerting to English students to find that “Le poids atomique est égal au poids équivalent pour les éléments suivants: … Pour tous les autres éléments, la valeur du poids atomique est double de celle de l'equivalent.” In other respects the book is well up to date, and contains much useful information expressed with the clearness and precision for which French text-books are deservedly famed.

Leçons de Chimie.

Par H. Gautier G. Charpy. (Paris: Gauthier-Villars, 1894.)

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