XII. PRIMITIVE FOLK. By Elie Reclus.

“For an introduction to the study of the questions of property, marriage, government, religion,—in a word, to the evolution of society,—this little volume will be found most convenient.”—Scottish Leader.

XIII. THE EVOLUTION OF MARRIAGE. By Professor Letourneau.

“Among the distinguished French students of sociology, Professor Letourneau has long stood in the first rank. He approaches the great study of man free from bias and shy of generalisations. To collect, scrutinise, and appraise facts is his chief business.”—Science.

XIV. BACTERIA AND THEIR PRODUCTS. By Dr. G. Sims Woodhead. Illustrated.

“An excellent summary of the present state of knowledge of the subject.”—Lancet.

XV. EDUCATION AND HEREDITY. By J. M. Guyau.

“It is a sign of the value of this book that the natural impulse on arriving at its last page is to turn again to the first, and try to gather up and coordinate some of the many admirable truths it presents.”—Anti-Jacobin.

XVI. THE MAN OF GENIUS. By Professor Lombroso. Illustrated.

“By far the most comprehensive and fascinating collection of facts and generalisations concerning genius which has yet been brought together.”—Journal of Mental Science.