1904. Geology. Geologic Processes and their Results, Vol. I. pp. 654. New York. To be considered from the standpoint of the _agents_ and _processes_ which change animal habitats and result in their “orderly sequence.” VAN HISE, C. R. 1904. A Treatise on Metamorphism. U. S. Geol. Survey, Monog., Vol. XLVII, pp. 1-1286. A formidable-looking volume on account of its size, but one which will abundantly repay a careful study of its method, aside from the value of the content, for problems related to animals of the soils, etc. Particular attention should be given to the formulation of dynamic principles, and the application of the process method. DAVIS, W. M. 1909. Geographical Essays, pp. 777. New York. Essays on the orderly sequence of changing land forms, or to the ecologist, the development of inland habitats, in so far as they are dependent upon the physiographic conditions. WOODWORTH, J. B. 1894. The Relation between Baseleveling and Organic Evolution. Amer. Geol., Vol. XIV, pp. 209-235. The influence of baseleveling factors in the development of the gross environment and upon evolution. ADAMS, CHAS. C. 1901. Baseleveling and its Faunal Significance, with Illustrations from Southeastern United States. Amer. Nat., Vol. XXXV, pp. 839-852. The influence of baseleveling upon the sequence of changes in fresh-water and land habitats. (See Figures 4 and 5.) [Illustration: FIG. 4.--A small stream as an animal environment, with the preponderance of rapidly flowing water. Tumwater Cañon, Near Wenatchee Washington. Photo. by W. B. McCallum.] [Illustration: FIG. 5.--A small river as an animal environment. The rapid water conditions of a stream in an early stage of topographic development, such as is shown in Fig. 4, is here replaced by long pools of relatively quietly flowing water, connected by narrow stretches of more rapidly flowing water. Wabash River, Bluffton Indiana. Photo. by N. Miller and E. B. Williamson. ] BRANDT, K. 1899. Ueber den Stoffwechsel im Meere. Wissen. Meeruntersuchungen, heraus. v. d. Komm. zur wissen. Unters. deutschen Meere in Kiel. N. F. Abth. Kiel, Bd. IV, pp. 213-230. 1901. Life in the Ocean. Smithsonian Report for 1900, pp. 493-506. A translation of the preceding paper on the transformation of substance or “cycle of matter” in the sea. The extensive footnotes are omitted. 1902. Ueber den Stoffwechsel im Meere. 2 Abhand. Wiss. Meeresunt. heraus. v. d. Komm. zur wissen. Unters. deutschen Meere in Kiel, N. F. Bd. VI, Abth. Kiel, pp. 23-79. 1905. On the Production and Conditions of Production in the Sea. Rapports et Procés-Verbaux, Inter. Council for the Exploration of the Sea, Vol. III, Appendix D. Copenhagen. Not seen by the writer. Johnstone states that it is a summary of the papers of 1899 and 1902. JOHNSTONE, J. 1908. Metabolism in the Sea. pp. 206-298. In “Conditions of Life in the Sea.” Cambridge, England. BIRGE, E. A.