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. “Stimulating, learned, lucid.”—Liverpool Courier.

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.

72. PLANT LIFE