44. PRINCIPLES OF PHYSIOLOGY. By Prof. J. G. McKendrick, M.D.
46. MATTER AND ENERGY. By F. Soddy, M.A., F.R.S.
49. PSYCHOLOGY, THE STUDY OF BEHAVIOUR. By Prof. W. McDougall, F.R.S., M.B.
57. THE HUMAN BODY. By Prof. Sir A. Keith, M.D., LL.D. (Illustrated.)
58. ELECTRICITY. By Gisbert Kapp, D.Eng. (Illustrated.)
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.
72. PLANT LIFE. By Prof. J. B. Farmer, D.Sc., F.R.S. (Illustrated.)
78. THE OCEAN. A General Account of the Science of the Sea. By Sir John Murray, K.C.B., F.R.S. (Colour Plates and other Illustrations.)
79. NERVES. By Prof. D. Fraser Harris, M.D., D.Sc. (Illustrated.)