Reprints. Caldwell, Otis W. The Life History of Lemna Minor. Pp. 32.--Calkins, G. N. Some Hydroids from Puget Sound. Pp. 24, with six plates.--Cope, Edward D. Vertebrate Remains from the Port Kennedy Bone Deposit. Pp. 75, with plates.--Fitz, G. W. Play as a Factor in Development. Pp. 7; The Hygiene of Instruction in Elementary Schools. Pp. 7.--Howard, William Lee. Double Personality; Lenten Hysteria. Pp. 8.--Howe, R. H., Jr. North American Wood Frogs.--Hunt, Charles Wallace. The Engineer: His Work, his Ethics, his Pleasures. (President's Address, American Society of Mechanical Engineers.) Pp. 15.--Hunter, S. J. The Coccidæ of Kansas. Pp. 15, with plates.--Krauss, W. C. The Stigmata of Degeneration. Pp. 360.--Lichty, D. Thalassic Submersion a Means of Disposal of the Dead. Pp. 12.--McDonald, Arthur. Emile Zola. Pp. 16.--Phillips, W. B. Iron Making in Alabama. Montgomery. Pp. 380.--Saunders, De Alten. Phycological Memoirs. Pp. 20, with plates.--Schlicht, Paul J. A New Process of Combustion. Pp. 32.--Stevens, F. L. The Effect of Aqueous Solutions upon the Germination of Fungus Spores. Pp. 30.--Stock, H. H. The International Correspondence Schools, Scranton, Pennsylvania. Pp. 12.--Urn, The. Modern Thought on Modern Cremation. United States Cremation Company. Pp. 40.--Veeder, M. A. The Relative Importance of Flies and Water Supply in Spreading Disease. Pp. 8. Robinson, Albert Gardner. The Porto Rico of To-day. New York: Charles Scribner's Sons. Pp. 240, with maps. $1.50. Salazar, A. E. Kalkules de Kañerius de Agua (Calculations of Water Conduits). Santiago de Chile. Pp. 246. Schnabel, Dr. Carl. Handbook of Metallurgy. Translated by Henry Louis. 2 vols. New York: The Macmillan Company. Pp. 876 and 732. $10. Seligman, E. R. A. The Shifting and Incidence of Taxation. Second edition. New York: The Macmillan Company. Pp. 337. $3. Semon, Richard. In the Australian Bush and on the Coast of the Coral Sea. New York: The Macmillan Company. Pp. 552. $6.50. Spencer, Baldwin, and Gillen, F. J. The Native Tribes of Central Australia. New York: The Macmillan Company. Pp. 671, with plates. $6.50. Technology Review, The. A Quarterly Magazine relating to the Massachusetts Institute of Technology. January, 1899. Pp. 143. 35 cents. United States National Museum. Annual Report for the Year ending June 30, 1896. (Smithsonian Institution.) Washington. Pp. 1107, with plates. Weir, James. The Dawn of Reason. Mental Traits in the Lower Animals. New York: The Macmillan Company. Pp. 234. $1.25. Westcott, Edward N. David Harum. New York: D. Appleton and Company. Pp. 392. $1.50. Whipple, G. C. The Microscopy of Drinking Water. New York: John Wiley & Sons. Pp. 300, with nineteen plates. $3.50. Wilkinson, F. The Story of the Cotton Plant. (Library of Useful Stories.) New York: D. Appleton and Company. Pp. 191. 40 cents. FOOTNOTES: [14] Earth Sculpture, or the Origin of Land Forms. By James Geikie. New York: G. P. Putnam's Sons. Pp. 397. Price, $2.