"Takes up essential points in evolution, environment, prophylaxis, and sanitation bearing upon the preservation of public health."—Lancet.
XXI. MODERN METEOROLOGY. By FRANK WALDO, Ph.D., etc. With 112 Illustrations.
"The present volume is the best on the subject for general use that we have seen."—Daily Telegraph.
XXII. THE GERM-PLASM: A THEORY OF HEREDITY. By Dr. A. WEISMANN. Illustrated.
"There has been no work published since Darwin's own books which has brought to light so many new facts."—British Medical Journal.
XXIII. INDUSTRIES OF ANIMALS. By F. HOUSSAY. Illustrated.
"His accuracy is undoubted, yet his facts out-marvel all romance. These facts are here made use of as materials wherewith to form the mighty fabric of evolution."—Manchester Guardian.
XXIV. MAN AND WOMAN: A STUDY OF HUMAN SECONDARY SEXUAL CHARACTERS. By HAVELOCK ELLIS. With Illustrations.
"There is no work approaching his [Mr. Ellis's] in exhaustiveness, accuracy, and fairness of judgment."
XXV. THE EVOLUTION OF MODERN CAPITALISM. A STUDY OF MACHINE PRODUCTION. By JOHN A. HOBSON, M. A. With Diagrams.