By J. ARTHUR THOMSON, M.A., Regius Professor of Natural History, Aberdeen University. "Professor Thomson's delightful literary style is well known; and here he discourses freshly and easily on the methods of science and its relations with philosophy, art, religion, and practical life."--_Aberdeen Journal._ 36. _CLIMATE AND WEATHER_ By Prof. H. N. DICKSON, D.Sc. Oxon., M.A., F.R.S.E., President of the Royal Meteorological Society. (With Diagrams.) "The author has succeeded in presenting in a very lucid and agreeable manner the causes of the movements of the atmosphere and of the more stable winds."--_Manchester Guardian._ 41. _ANTHROPOLOGY_ By R. R. MARETT, M.A., Reader in Social Anthropology in Oxford University. "An absolutely perfect handbook, so clear that a child could understand it, so fascinating and human that it beats fiction 'to a frazzle.'"--_Morning Leader._ 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._ 58. _ELECTRICITY_ By GISBERT KAPP, D.Eng., Professor of Electrical Engineering in the University of Birmingham. (Illustrated.) "It will be appreciated greatly by learners and by the great number of amateurs who are interested in what is one of the most fascinating of scientific studies."--_Glasgow Herald._ 62. _THE ORIGIN AND NATURE OF LIFE_ By Dr BENJAMIN MOORE, Professor of Bio-Chemistry, University College, Liverpool. 67. _CHEMISTRY_ By RAPHAEL MELDOLA, F.R.S., Professor of Chemistry in Finsbury Technical College, London. Presents clearly, without the detail demanded by the expert, the way in which chemical science has developed, and the stage it has reached. In Preparation