The Subscription REDUCED from $8.00 to $6.00 a year. Price TTELLS LIVING UNEQUALLEDIN QUALITY AND QUANTITY 66 WORLD'S GREATEST INTELLECTS CONTRIBUTE TO MAKE THIS PERIODICAL Encyclopedic in Scope, Character, Completeness, Comprehensiveness Every intelligent reader will find in THE LIVING AGE Food to Nourish, Stimulate, and Inspire Thought. The ablest and brightest men and women of the world have read and commended It during more than half a century. "Exhaustive Reviews of recent publications, the latest results of Scientific Research, Biographical Sketches of eminent characters, Travel, Exploration, Literary Criticism, and every phase of Culture and Progress in Europe Fiction and Choice Poetry - all these make up THE LIVING AGE."- Evening Bulletin, Phila. A Weekly Magazine, it gives nore than Three and a Quarter Thousand double column octavo pages of reading-matter yearly, forming four large volumes. The Subscription REDUCED from $8.00 to $6.00 a year. Price This makes The Living Age absolutely the cheapest magazine published. CLUE RATES. For $9.00 THE LIVING AGE and any one of the American $4.00 monthlies; or for $8.00 THE LIVING AGE and any one of the $3 00 monthl'es, will be sent for a year, post-paid. Rates for clubbing THE LIVING AGE with other periodicals will be sent on application. Address, LITTELL & CO., P. O. Box 5206, Boston. For $9.00 LITTELL'S LIVING AGE and THE AMERICAN NATURALIST, will be sent, each one year, postpaid." DEVOTED TO THE NATURAL SCIENCES IN THEIR WIDEST SENSE. MANAGING EDITORS: PROFS. E. D. COPE, Philadelphia, AND J. S. KINGSLEY, Tufts College, College Hill, Mass. E CLASSIFICATION OF DIATOMS (BACILLARI- Marriage. CENT BOOKS AND PAMPHLETS. Minerology-Contact Goniometer with two . 564 570 . . 575 No. 355 Colorado-Basic Dykes near Lake Memphremagog-The Origin of the Maryland GranitesPetrographical Notes. PAGE . . 576 Botany-Tilden's American Alge-The Columbines of North America-Sets of North American Plants-Botany in Buffalo-Blanks for "Plant Analysis"-Botanical News. . . . 584 Zoology-Japanese Leeches-The Origin of Tail-forms-The Spermatheca in some American Newts and Salamanders-Zoological News. 590 Entomology-The Asymmetry of the Mouthparts of Thysanoptera. (Illustrated.)-A New African Diplopod Related to PolyxenusNorth American Crambida--New Mallophaga -Entomological Notes. Embryology-Protoplasmic Continuity-Cell Studies in Annelid Eggs. 591 . 597 Psychology-A Study in Morbid Psychology, with some reflections. (Continued). . . . 599 Anthropology-Mr. Kean on Paleolithic Man -Cave Cave Exploration by the University of Pennsylvania in Tennessee. (Illustrated.) SCIENTIFIC NEWS. PHILADELPHIA, U. S. A. . 606 611 THE EDWARDS & DOCKER CO., 518 AND 520 MINOR STREET. ared at the Philadelphia Post Office as second-class matter. THE OLDEST CIVILIZED MEN. (Illustrated.) E. D. Cope. 616 ON THE ROLE OF ACID IN THE DIGESTION OF CERTAIN RHIZOPODS. John C. Hemmeter, M. D. 619 THE BACTERIAL DISEASES OF PLANTS: A CRITICAL REVIEW OF THE PRESENT STATE OF OUR KNOWLEDGE. Erwin F. Smith, 626 THE MEANING AND STRUCTURE OF THE SO-CALLED MUSHROOMS BODIES" OF THE HEXAPOD BRAIN. F. C. Kenyon, Ph. D. 643 DITOR'S TABLE.-Priority of Publication; Vice Presidents of the American Association; The Decimal Catalogue System. ECENT LITERATURE-The Structure of Solpugids The Bears of North America. 653 ECENT BOOKS AND PAMPHLETS. ENERAL NOTES. Petrography The Eruptives and Tuffs of tschen-A Nepheline-Syenite Bowlder from io-Crystalline Rocks of New Jersey-SimCrystalline Rocks from India and Australia The Weathering of Diabase-Petrographical 660 Geology and Paleontology-The Limestones of |