44. THE PRINCIPLES OF PHYSIOLOGY
By Prof. J. G. McKendrick, M.D. "It is a delightful and wonderfully comprehensive handling of a subject which, while of importance to all, does not readily lend itself to untechnical explanation. . . . Upon every page of it is stamped the impress of a creative imagination."—Glasgow Herald.
46. MATTER AND ENERGY
By F. Soddy, M.A., F.R.S. "Prof. Soddy has successfully accomplished the very difficult task of making physics of absorbing interest on popular lines."—Nature.
49. PSYCHOLOGY, THE STUDY OF BEHAVIOUR
By Prof. W. McDougall, F.R.S., M.B. "A happy example of the non-technical handling of an unwieldy science, suggesting rather than dogmatising. It should whet appetites for deeper study."—Christian World.
53. THE MAKING OF THE EARTH
By Prof. J. W. Gregory, F.R.S. (With 38 Maps and Figures.) "A fascinating little volume. . . . Among the many good things contained in the series this takes a high place."—The Athenæum.
57. THE HUMAN BODY
By A. Keith, M.D., LL.D., Conservator of Museum and Hunterian Professor, Royal College of Surgeons. (Illustrated.) "It literally makes the 'dry bones' to live. It will certainly take a high place among the classics of popular science."—Manchester Guardian.