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Rh The Bear River Formation and Its Characteristic Fauna; No. 129. Earthquakes in California in 1894; No. 131. Report of Progress of the Division of Hydrography for the Calendar Years 1893-'94; No. 131. The Disseminated Lead Ores of Southeastern Missouri; No. 133. Contributions to the Cretaceous Paleontology of the Pacific Coast; The Fauna of the Knoxville Beds; No. 1.34. The Cambrian Rocks of Pennsylvania.—United States National Museum: Proceedings of.—Gill, Theodore: Note on Plectroplites and Hypoplectrodes, Genera of Serranoid Fishes.—Mearns, E. A.: Preliminary Description of a New Subgenus and Six New Species and Subspecies of Hares from the Mexican Border of the United States.—Rathbun, Mary J.: Description of Two New Species of Fresh-water Crabs from Costa Rica and the Genus Callinectes.—Ridgway, R.: Characters of a New American Family of Passerine Birds, and On Birds collected by W. L; Abbott, etc.

Conger, C. B. Air-Brake Catechism. New York: (256 Broadway) Locomotive Engineering. Pp. 95. 25 cents.

Crehore, Dr. Albert C. Experimental Determination of the Motion of Projectiles inside the Bore of a Gun with the Polarizing Photo-chronograph. Fort Monroe, Va.: Artillery School Press. Pp. 84.

Eckhoff, William J. Herbart's A B C of Sense-Perception. (International Education Series.) New York: D. Appleton & Co. Pp. 288. $1.50.

Farnham, Amos W. The Oswego Method of Teaching Geography. Syracuse: C. W. Bardeen. Pp. 121. 50 cents.

Frye, Alexander Everett. Home and School Atlas. New York and London: Ginn & Co. Pp. 48.

Gattermann, Ludwig. The Practical Methods of Organic Chemistry. Translated by William B. Shorber. New York and London: Macmillan & Co. Pp. 329. $1.60.

Hogan, Louise E. How to Feed Children. Philadelphia: J. B. Lippincott Co. Pp. 236.

Jackmann, Wilbur S. Nature Study and Related Subjects for the Common Schools. Chicago: The Author. Pp. (text) 167; charts, 23.

Lubbock, Sir John. The Scenery of Switzerland and the Causes to which it is Due. New York and London: Macmillan & Co. Pp. 371. $1.50.

Mathews, F. Schuyler. Familiar Trees and their Leaves. New York: D. Appleton & Co. Pp. 320. $1.75.

McMurry, Charles A. Special Method in Natural Science for the First Four Grades of the Common School. Bloomington, 111.: Public School Publishing Company. Pp. 210. 50 cents.

McPherson, Logan G. The Monetary and Banking Problem. New York: D. Appleton & Co. Pp. 1.35. $1.

Meyers, William J. An Inductive Manual of the Straight Line and the Circle. Fort Collins, Col.: William J. Meyers. Pp. 113. 50 cents.

Mourgues, L. La Epidemia de Fiebra Tyfoidea en los Cerros Alegre i Concepción (The Epidemic of Typhoid Fever in Cerros Alegre and Concepcion). Santiago de Chile: Cervantes.

Musée Social (Social Museum). Bulletins. Series A, Circulars 1 to 6. Series B, Circular 1. Paris, France: Robert Pinot, Director General.

Reprints. Brinton, D. G.: Left-handedness in North American Aboriginal Art (American Anthropologist, May, 1896).—Dolley, C. S.: The Planktonokrit; a Centrifugal Apparatus for the Volumetric Estimation of the Food Supply of Oysters and other Aquatic Animals (Proceedings of the Academy of Natural Sciences of Philadelphia, May, 1896).—English, W. T.: Cardiac Instability due to Acid Auto-intoxication (Journal of the American Medical Association, June 8, 1895), and Should the Cardiopath Marry? (Pittsburgh Medical Review, April, 1895).—Llano, A.: Morality the Last of Dogmas (Philosophical Review, vol. V, No. 4) Putnam, F. W., and Willoughby, C. C.: Symbolism in Ancient American Art (Proceedings of American Association for the Advancement of Science, vol. xliv, 1896).—Smith, H. I.: Notes on the Data of Michigan Archæology (American Antiquarian, May, 1896).—Ward, Lester F.: Ethical Aspects of Social Science (International Journal of Ethics, July, 1896).

Richardson, B. W. Biological Experimentation. New York: Macmillan & Co. London: George Bell & Sons. Pp. 170. $1.

Russell, Ernest E. The Reason Why. New York: E. E. Russell (13 Astor Place). Pp. 365.

Russell, E. H. Child Observations. Boston: D. C. Heath & Co. Pp. 267. $1.50.

United States Commissioner of Labor. Tenth Annual Report, Vol. I, 1894; Strikes and Lockouts. Pp. 1373.

United States Geological Survey, J. W. Powell, Director. Fifteenth Annual Report, 1893-'94. Pp. 755.—Sixteenth Annual Report, Charles D. Walcott, Director, 1864-'95. Parts II, III, and IV. Pp. 598, 645, and 735.



X Rays in Surgery.—Considerable advance has been made during the past few months in the application of the X ray to surgical diagnosis, and it seems fairly certain now that the trunk with its contents, as well as the extremities, may be examined by the use of this agent. A recent article in the American Journal of the Medical Sciences, by W. W. Keen, includes some remarkably clear reproductions of X-ray pictures, one of which shows very beautifully all the bones of the trunk. Among much interesting matter the article contains a suggestion which deserves at least a trial. The difficulty with the present pictures is that an exposure which is long enough to show the bones blots out all detail in the soft parts. Dr. Keen suggests the use of a number of superposed paper films. The X rays will act almost equally on them all, and by withdrawing one at a time at short intervals a series of pictures of the object will be obtained which should show all the required detail. An important improvement in the Röntgen apparatus is said to have been made by the General Electrical Company of