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 158 NEW BOOKS. positive, d'autre part sur le (Louie et les conjectures me'taphysiques. La fra- ternite n'est que la mise en pratique de la plus haute speculation sur 1'univers et sur le sens clu ' mystere eternel '." Examen critique de la Loi psychophysique, sa Base et sa Signification. Par .1. DELBOEUF, Professeur a 1'Universite de Liege. Paris : Germer Bailliere, 1883. Pp. 192. Carrying out his plan of collecting his numerous minor writings under the feneral title of x "Questions of Philosophy and Science," the author here )llows up his Elements der Psychophysique (see MIND XXXII. 620) with a reprint of various critical articles written in 1877-8. The volume is dis- posed in two parts "Hering against Fechner " (pp. 1-69), and "Fechner against his Adversaries" (pp. 71-168), with supplementary notes. The first gives an account of Bering's famous onslaught (1875) upon Fechner's psychophysical law, the force of which Delboeuf concedes at many points, but which he repels so far as it impugns the mathematical expression of the law. In the second part he follows Fechner over the ground traversed in the work In Sachen der Psythophysik (1877), and then enters upon an independent discussion of the possibility of measuring sensation, con- cluding with a short exposition of his own " new theory of sensibility ". His general judgment on Fechner's psychophysical doctrine is that, though its range is essentially limited, not extending beyond the domain of ele- mentary sensation, its results are yet of the highest importance, so that no pains should be spared to obtain for it a formula admitting of strictly rational interpretation. To supply this is the special object of his own polemic with Fechner. Logik. Eine Untersuchung der Principien der Erkenntniss u. der Methoden wissenschaftlicher Fofschung. Von WILHELM WUNDT. Zweiter Band. ' Methodenlehre '. Stuttgart : Enke, 1883. Pp. xiii., 620. The second and concluding volume of Prof. Wundt's Logik runs to even greater length than the first, which was reviewed fully in MIND XIX. on its appearance in 1880. As that corresponded with the first topic of the sub-title, ' Cognition,' so the present volume corresponds with its second topic, ' Method '. It consists of four main sections, with subdivi- sions : I. General Doctrine of Method (1, Methods of Investigation. 2, Forms of Systematic Exposition), pp. 1-73 ; II. Logic of Mathematics (1, General Logical Methods of Mathematics. 2, Arithmetical Methods. 3, Geometrical Methods. 4, The Notion of Function and the Infinitesimal Method), pp. 74-219 ; III. Logic of the Natural Sciences (1, General Foundations of Natural Inquiry. 2, Logic of Physics. 3, Logic of Chemistry. 4, Logic of Biology), pp. 220-477 ; IV. Logic of the Mental Sciences (1, General Foundations of the Mental Sciences. 2, Logic of the Historical Sciences. 3, Logic of the Social Sciences. 4, The Methods of Philosophy), pp. 478-620. Geschichte der neueren Philosophic von Baco u. Cartesius bis zur Gegemvart. Von Dr. ALBERT STOCKL, Professor der Philosophic an der bischof- lichen Akademie in Eichstatt, Mitglied der romischen Akademie des heil. Thomas. 2 Bande. Mainz : Kirchheim, 1883. Pp. viii., 502 ; vii., 643. The author intends this work as a continuation of his elaborate Geschichte der Philosophic des Mittelalters, of which the third and concluding volume appeared in 1866. It is the first attempt by a Roman Catholic to give a detailed exposition and appreciation of the whole history of modern philo-