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Reviews of Mathematical Investigations.

conditions and relations through a series of connecting levers. This dy-namical solution of economic problems is both novel and instructive.

Prom review by Enrico Barone. Giornale Degtt Economisti , May, 1894,pp. 413, 428.

II Prof. Irving Fisher, dell’universitS, di Yale, ha nel ’92 pubblicato unostudio, piccolo di mole, ma ricco di idee originali, sulla teoria del valore edei prezzi (1). L’originalita di questo notevole contribute alia scienza con-siste in ci6 essenzialmente, che per alcuni problemi di economia pura,l’autore ha immaginato—ed ha realmente fatto costrurre—un apparecchioche ne da meccanicamente la soluzione. . . .

L’apparecchio del Fisher, come dicemmo, e tutt’altro che una mera curi-osity scientifica.

From L’Emploi des Mathematiques en Economie Politique by JacquesMoret. M. Giard & fi. Briere, Paris, 1915, p. 136.

Dans sa remarquable etude intitulee Mathematical investigations in thetheory of value and prices (2), il a, en effet, tout en faisant etat destravaux de ses pred^cesseurs, notamment de ceux de Jevons et de MM.Auspitz et Lieben, pose les principes ou du moins foumi les germes destheories les plus recentes.

From review of French translation. The Economic Journal, September ,1917, p. 451.

A translation of Professor Irving Fisher’s celebrated work. The authorin a preface to the French edition arranges the leading ideas of the bookunder four heads: (1) the use of mathematics in economic science, and(2) of physical, especially hydrostatic analogies; (3) utility as a meas-urable quantity; (4) interdependent utilities—“competive” and comple-mentary goods. Among the hydrostatic analogies akin to those of theauthor the illustration in The Economic Journal, September , 1895, p. 434,is mentioned by him too modestly. It was fathered by him.