17. HEALTH AND DISEASE
By W. Leslie Mackenzie, M.D., Local Government Board, Edinburgh. "Dr Mackenzie adds to a thorough grasp of the problems an illuminating style, and an arresting manner of treating a subject often dull and sometimes unsavoury."—Economist.
18. INTRODUCTION TO MATHEMATICS
By A. N. Whitehead, Sc.D., F.R.S. (With Diagrams.) "Mr Whitehead has discharged with conspicuous success the task he is so exceptionally qualified to undertake. For he is one of our great authorities upon the foundations of the science."—Westminster Gazette.
19. THE ANIMAL WORLD
By Professor F. W. Gamble, D.Sc., F.R.S. With Introduction by Sir Oliver Lodge. (Many Illustrations.) "A delightful and instructive epitome of animal (and vegetable) life. . . . A fascinating and suggestive survey."—Morning Post.
20. EVOLUTION
By Professor J. Arthur Thomson and Professor Patrick Geddes. "A many-coloured and romantic panorama, opening up, like no other book we know, a rational vision of world-development."—Belfast News-Letter.
22. CRIME AND INSANITY
By Dr C. A. Mercier. "Furnishes much valuable information from one occupying the highest position among medico-legal psychologists."—Asylum News.