Although not all the promised monographs of this series have yet appeared, already one of the earlier ones has come to a second edition. This is satisfying evidence that the value of these publications is being recognized. So rapidly changing is the subject-matter of biochemistry that no other form of publication can well be so efficient as the one adopted here; namely, inexpensive monographs written by specialists, each covering that part of the entire field with which each writer is most intimately acquainted..
"The Nature of Enzyme Action," the first of the series to enter a second edition, covers adequately and accurately this interesting and fundamentally important subject. Presented originally in the form of lectures, it is more easy to read and assimilate than treatises of this sort are likely to be, a point of particular favor in the eyes of readers who are interested in the subject only in