General Chemistry of the Enzymes.

On account of the highly technical nature of this book this not the place for a critical review. A few words explaining its generalscope may be in order, however. In 1907 and again in 1910 the author published reports on enzmes inErgebnisse der Physiologie, which were arranged and issued in book form. The English translation before us has received numerous additions and alterations, and in it is a succinet review of the imporant facts about enzymes from the point of view of general and physical chemistry. In the lectures on enzymes recently published by Cohnheim, the subject is treated more from the biologic point of view, so that these two books serve to complement each other. Euler's book is the larger, and contains chapters on the special chemistry of the enzymes and their physical properties; enzymic activators, paralysors and poisons; chemical dynamics of enzyme reactions; influence of temperature and radiation; chemical statics in enzyme reactions; enzymic syntheses, and specificity of enzyme action. There is an appendix giving methods not easily accessible, and also Bertrand's tables for the estimation of sugar. We have here a highly useful book for all who are interested in enzymology.