The book before us deals not only with pure A science, but also with technology and philosophy. It is thus able to place science in a frame of other knowledge, and show the relations and cross-connexions between them. This method is desirable, indeed necessary, if a true appreciation of the picture is to be obtained. The early development of modern science was inevitably influenced by the philosophic environment in which it grew, and gained much by the gradual improvements in scientific implements, and by the problems thrust upon science by medicine and technology. A History of Science, Technology and Philosophy in the 16th and 17th Centuries By Prof. A. Wolf, with the co-operation of Prof. Dr. F. Dannemann and A. Armitage. (History of Science Library.) Pp. xxvii + 693 + 68 plates. (London: George Alien and Unwin, Ltd., 1935.) 25s. net.