1907. The Respiration of an Inland Lake. Trans. Amer. Fisheries Soc., Vol. XXXVI, pp. 223-241. 1904. The Thermocline and its Biological Significance. Trans. Amer. Micros. Soc., Vol. XXV, pp. 5-33. Two studies in the sequential changes in the lake habitat. BIRGE, E. A., and JUDAY, C. 1911. The Inland Lakes of Wisconsin. The Dissolved Gases of the Water and their Biological Significance. Wis. Geol. and Nat. Hist. Survey, Bull. No. 22. pp. 259. PETERS, A. W. 1907. Chemical Studies on the Cell and its Medium. Part II, Some Chemico-Biological Relations in Liquid Culture Media. Amer. Jour. Physiol., Vol. XVIII, pp. 321-346. A study of changes in media and their biotic succession. COWLES, H. C. 1911. The Causes of Vegetative Cycles. Bot. Gaz., Vol. LI, pp. 161-183. Also Ann. Associa. Amer. Geogr., Vol. I, pp. 1-20. 1912. An important statement of the general principles and causes of vegetational changes. Includes a history of the subject. 1901. The Physiographic Ecology of Chicago and Vicinity; A Study of the Origin, Development, and Classification of Plant Societies. Bot. Gaz., Vol. XXXI, pp. 73-108, 145-182. A study of changes in the vegetation from the process and genetic standpoint. CLEMENTS, F. E. 1904. The Development and Structure of Vegetation. Bot. Surv. Nebraska, VII. pp. 175. Lincoln. Deals with vegetative changes from the process standpoint. 1905. Research Methods in Ecology, pp. 334. Lincoln, Neb. CRAMPTON, C. B. 1911. The Vegetation of Caithness Considered in Relation to the Geology. pp. 132. Comm. for the Survey and Study of British Vegetation. 1912. The Geological Relations of Stable and Migratory Plant Formations. Scottish Bot. Rev., Vol. I, pp. 1-61. Good examples of the process standpoint as applied to the vegetation. WARMING, E. (Trans. by P. GROOM and I. B. BALFOUR.) 1909. Œcology of Plants. pp. 422. Oxford. A treatise on the general principles of plant ecology, and an index to the literature. ZON, RAPHAEL. 1906. Principles Involved in Determining Forest Types. Proc. Soc. Amer. Foresters, Vol. I, pp. 179-189. Discusses the sequence of change in the forest. OSTENFELD, C. H. 1908. On the Ecology and Distribution of the Grass-Wrack (_Zostera marina_) in Danish Waters. Rep. Danish Biol. Sta. to Board of Agriculture, Vol. XVI, 1908. Trans. from the Fiskeri-Beretning for 1907, pp. 1-62. An important paper showing the controlling relation of marine vegetation upon animal associations and particularly the fish of the coast. References to related zoölogical papers. MOORE, J. E. S. 1903. The Tanganyika Problem. pp. 371. London. On pp. 107-119 Moore describes the invasion and succession of vegetation upon alluvial flats, recently drained. A graphic account of forest invasion. Apparently a little known study. ERNST, A. (Trans. by A. C. SEWARD.) 1908. The New Flora of the Volcanic Island of Krakatau. pp. 74. Cambridge.