ii HUNTINGTON AND CUSHING'S Principles of Human Geograph seems to me to fill a most important gap in the teaching of Geography by connect handled properly by a teacher of Geography must vitalize that subject tre mendously. The frame work of history is all in this book--and it should be used as much in the teaching of history as of geography. It acts also as a stimulant to teachers of both geography and history to get closer to th It has 430 Pages, 6 by 9. Profusely Illustrated-Price, $3.50 JOHN WILEY & SONS, Inc. 432 Fourth Avenue LONDON: Chapman & Hall, Ltd. H NEW YO A Series of Talks on Hydrogen-ion Measurements A Résumé of Advantages of a A Potentiometer derives its accuracy from that of a Cadmium Standard Cell-the universal standard of electromotive force. To the user who makes electrometric determinations of H-ion concentrations, the L. & N. Type K Potentiometer Outfit offers the following advantages: 1. Its accuracy is independent of the calibration of its galvanometer, which is used only for indicating the point of balance. 2. Its very extended scale gives great precision. This is important in an accurate determination of small changes in H-ion concentration. Such determinations cannot be made accurately by any other simple method. 3. It is very simple to operate, and the user can always verify his measurements by direct comparison with the e. m. f. of the Cadmium Standard Cell. 4. Its great sensitivity makes it possible to secure an accurate balance with a hydrogen electrode of very small dimensions. No appreciable polarization occurs, and no time is lost in waiting for equilibrium of the electrode. The smaller the electrode surface, the more rapidly does it attain equilibrium. 5. It has proved its worth to hundreds of users-satisfactory performance in their hands is assurance of excellent service to you. 6. Behind every outfit stands an organization that has a reputation to safeguard, and that will go more than halfway in service to its customers on problems involving electrical measurement. The information contained in Catalogue $75 may be of service to you. It deals with the particular phase of electrical measurements that bears on measurements of H-ion concentrations. Leeds & Northrup Company Electrical Measuring Instruments 4901 Stenton Avenue Philadelphia, Pa. iv Lo, A Greater Psychologist than Freud is Now Wit PSYCHO-PATHOLOG By EDWARD J. KEMPF, M.D. Clinical Psychiatrist to St. Elizabeth's Hospital (formerly Government Hospital for the Washington, D. C.. author of "The Autonomic Functions and the Personality.". 762 pag Printed on beautiful India tint paper, and bound in 6 x94, with 97 illustrations. binding, with gold stamping. Price, $9.50. NOT since Freud startled the scientific world IN "Current Opinion" for Decembe with his views upon psychology has a appeared than more epoch-making book Some say Kempf's PSYCHOPATHOLOGY. that he has already displaced Freud as being the most advanced thinker in the world along these lines. Partial Table The Physiological Foundations of the Personal- or on S Tridon, author and lecturer analysis, asserts "that Freud will al revered as the founder of psychoanal that the sceptre has already passed o hands. His disciples, Jung and Adl the first to break his authority; and third figure, EDWARD J. KEMPF, is supremacy." of Contents chopathology of Paranoia; The Psy KEMPF'S " PSYCHOPATHOLOGY" is presented to psychopathologists, physicia ologists, psychologists, teachers, judges, lawyers, custodians and directors of educational and custodial institutions to assist them to a clearer understanding of the abnormal of ally abnormal individual. Undoubtedly this book will take its place C. V. Mosby Co., Publishers CUT HERE AND MAIL TODA C. V. MOSBY CO., St. Louis, Send me a copy of Dr. Kemp book on PSYCHO-PATHOLOGY, fo I enclose $9.50, or you may send Send for on medicine, nursing, Publications of Publications of Carnegie Institution of Washington The Philippine Bureau of Scien The publications of the Institution now number over 400 volumes, the subjects including Anatomy, Archæology, Astronomy, Botany, Chemistry, Climatology, Economics and Sociology, Embryology, Experimental Evolution and Heredity, Engineering, Folk-Lore, Geology, History, International Law, Literature, Mathematics, Medicine, Nutrition, Paleontology, Philology, Physics, Stereochemistry, Terrestrial Magnetism, Zoology. Classified and descriptive lists will be sent postpaid on application. 274. Contributions to Embryology. Quarto, III+170 pages. Price $15.00 Danchakoff, Vera. Myeloid Metaplasia of the Embryonic Mesenchyme in relation to Cell Potentialities and Differential Factors. 32 pp., 5 pls. Lineback, P. E. Studies on the Longitudinal Muscle of the Human Colon, with special reference to the Development of the Tæniæ. 12 pp., 8 figs. Wislocki, G. B. Experimental Studies on Fetal Absorption. I: The Vitally Stained Fetus. 16 pp., 4 pls., 1 fig. Ingalls, N. W. A Human Embryo at the Beginning of Seg. mentation, with special reference to the Vascular System. 30 pp., 5 plates, 1 text figure. Barry, L. W. The Effects of Inanition in the Pregnant Albino Rat with Special Reference to the Changes in the Relative Weights of the Various Parts, Systems and Organs of the Offspring. 46 pp. Corner, G. W. A Case of True Lateral Hermaphroditism in a Pig with Functional Ovary. 6 pp., 1 pl. Streeter, G. L. Weight, Sitting Height, Head Size, Foot Length, and Menstrual Age of the Human Embryo. 28 pp., 2 figs., 6 charts. All communications should be addressed to CARNEGIE INSTITUTION OF WASHINGTON WASHINGTON, D. C. VEGETATION OF PHILIPPINE MOUNTA The relation between the environment physical types at different altitudes. William H. Brown. 434 pages, 41 plates, 30 text figures; postpaid $2.50, U. S. rency. INDEX TO THE GENERA OF BIRDS. A critical revision the Philippine species of plants described Blanco and by Llanos. By E. D. Mer 424 pages; postpaid $2.25, U. S. currenc PHILIPPINE WATER SUPPLIES. By G. Heise and A. S. Behrman. 218 pages, plates; postpaid $1.75, U. S. currency. AN INTERPRETATION OF RUMPHIUS'S HI BARIUM AMBOINENSE. By E. D. Mer 596 pages, 2 maps; postpaid $3.00, U. S. rency. THE PHILIPPINE JOURNAL OF SCIENCE monthly (no longer issued in sections), year $5.00, U. S. currency. A list of the publications of the Philipp Bureau of Science and a sample copy of Philippine Journal of Science will be sent u request. Subscriptions and orders for publicati should be sent to Visual Instruction WITH Spencer Delineascope MODEL 3 is made perfect because it is an Ideal Stereopticon for both lantern slides and opaque objects, such as post cards, pictures, reading matter and materials of all kinds, dead or alive. IDEAL, because it embodies basic ideas (patented possessed by no other. Example: Mechanical means for handling the slides, which does away with the old, antiquated lantern slide holder and at the same time gives a "dissolving effect" on the screen, unattained with other outfits except by using two stereopticons, one above the other. One Spencer Delineascope does it SPENCER BUFFALO U.S.A. Spencer Delineascope, Model 3, for both lantern slides and opaque objects. 1000 Watt Mazda lamp, complete, $185.00 New illustrated booklet K-11 sent on request SPENCER LENS COMPANY, Buffalo, N. Y. 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