Kingsley, J. S. Text-Book of Elementary Zoölogy. New York: Henry Holt & Co. Pp. 439.
Knerr, E. B. Relativity in Science. Silico-Barite Nodules from near Salina. Concretions. (Transactions of the Kansas Academy of Science.) Pp. 24.
Krõmskõp Color Photography. Philadelphia: Ives Krõmskõp. Pp. 24.
Liquid-Air Power and Automobile Company. Prospectus. Pp. 16.
MacBride, Thomas A. The North American Slime Molds. Being a List of Species of Myxomycetes hitherto described from North America, Including Central America. New York: The Macmillan Company. Pp. 231, with 18 plates. $2.25.
Meyer, A. B. The Distribution of the Negritos in the Philippine Islands and Elsewhere. Dresden (Saxony): Stengel & Co. Pp. 92.
Nicholson, H. H., and Avery, Samuel. Laboratory Exercises with Outlines for the Study of Chemistry, to accompany any Elementary Text. New York: Henry Holt & Co. Pp. 134. 60 cents.
Scharff, R. P. The History of the European Fauna. New York: Imported by Charles Scribner's Sons. Pp. 354. $1.50.
Schleicher, Charles, and Schull, Duren. Rhenish Prussia. Samples of Special Filtering Papers. New York: Eimer & Amend, agents.