Problems of Modern Science. Edited by Arthur Dendy. (Hump. 10s.
6d. net.)—In these eight lectures, delivered at King's College last year, well-known men of science discuss the present position of their special studies and the lines on which an advance will be made in the near future. The editor, Pro- fessor Dendy, outlines the many kinds of research in Biology. Professor Halliburton indicates the fascinating problems of the ductless glands, of vitamins and of the capillary circulation. Professor Richardson, as a. physicist, and Professor Nicholson, as a mathematician, discuss the quantum theory, with special relation to the constitution of the atom. Mr. J. B. Dateexpounds the new views of the stellar universe in a most instructive paper. Professor Smiles describes some of the recent work done in the chemistry of living plants. The imsrientifio reader will find some of the lectures difficult to follow, but the book gives a good idea of the progress that is being made in the main branches of natural science.