"Mr. Darwin's little volume on the habits and instincts of earth-worms is no less marked than the earlier or more elaborate efforts of his genius by freshness of observation, unfailing power of interpreting and correlating facts, and logical vigor in generalizing upon them. The main purpose of the work is to point out the share which worms have taken in the formation of the layer of vegetable mould which covers the whole surface of the land in every moderately humid country. All lovers of nature will unite in thanking Mr. Darwin for the new and interesting light he has thrown upon a subject so long overlooked, yet so full of interest and instruction, as the structure and the labors of the earth-worm."--_Saturday Review._ _Ants, Bees, and Wasps._ A Record of Observations on the Habits of the Social Hymenoptera. By Sir JOHN LUBBOCK, Bart., M. P., F. R. S., etc., author of "Origin of Civilization, and the Primitive Condition of Man," etc., etc. With Colored Plates. 12mo, cloth, $2.00. "This volume contains the record of various experiments made with ants, bees, and wasps during the last ten years, with a view to test their mental condition and powers of sense. The principal point in which Sir John's mode of experiment differs from those of Huber, Forel, McCook, and others, is that he has carefully watched and marked particular insects, and has had their nests under observation for long periods--one of his ants' nests having been under constant inspection ever since 1874. His observations are made principally upon ants because they show more power and flexibility of mind; and the value of his studies is that they belong to the department of original research." _Diseases of Memory._ An Essay in the Positive Psychology. By TH. RIBOT, author of "Heredity," etc. Translated from the French by WILLIAM HUNTINGTON SMITH. 12mo, cloth, $1.50. "M. Ribot reduces diseases of memory to law, and his treatise is of extraordinary interest."--_Philadelphia Press._ "Not merely to scientific, but to all thinking men, this volume will prove intensely interesting."--_New York Observer._ "M. Ribot has bestowed the most painstaking attention upon his theme, and numerous examples of the conditions considered greatly increase the value and interest of the volume."--_Philadelphia North American._ _Myth and Science._ By TITO VIGNOLI. 12mo, cloth, price, $1.50. "His book is ingenious; ... his theory of how science gradually differentiated from and conquered myth is extremely well wrought out, and is probably in essentials correct."--_Saturday Review._ "The book is a strong one, and far more interesting to the general reader than its title would indicate. The learning, the acuteness, the strong reasoning power, and the scientific spirit of the author, command admiration."--_New York Christian Advocate._