THE present may be emphatically termed the period of Monographs of Science. The vast accumulation of facts has long passed the bounds prescribed by the general treatises on physics or chemistry, in which it was formerly possible to find a readable and critical treatment of the subject as a whole. These were succeeded by encyclopaedic dictionaries, of the type of Beilstein, which, however useful and indeed invaluable for reference, make no claim to be readable or even critical. In all branches of science, however, the demand is insistent for a comparatively brief and comprehensive account of the present state of knowledge, and it is to meet this that the various series of sectional monographs have sprung up. Among the first of these were the admirable monographs on biochemistry edited by Hopkins and Plimmer from 1908 onwards, and in the series now under review we have the German equivalent of these. Originated as late as 1915, comparatively few volumes have as yet been issued, but the promised list of publications indicates, both by the subjects proposed and the distinction of the authors, that they will form a valuable addition to the biochemist's bookshelf. Die Biochemie in Einzeldarstellungen. Herausgegeben von Dr. A. Kanitz. (1) Temperatur und Lebensvorgange. Von Dr. A. Kanitz. Pp. x + 175. 54 marks. (2) &Uber kunstliche Ernahrung und Vitamine. Von Prof. Dr. F. Rohmann. Pp. vi + 150 + 2 plates. 42 marks. (3) Uber partielle Eiweisshydrolyse. Von Prof. Dr. M. Siegfried. Pp. iv + 64. 15 marks. (4) Die Einwirkung von Mikroorganismen auf die Eiweisskorper. Von Dr. P. Hirsch. Pp. x + 256. 63 marks. (Berlin: Gebruder Borntraeger, 1915–1918.)