In addition to the insects feeding upon cacti, their enemies or parasites are listed and also the scavengers, flower visitors, and incidentally associated species. This is a social community composed of 324 species of insects, and it forms an excellent foundation for a study of their interrelations. This is more ecological than is usually the case in economic reports. MÖLLER, L. 1867. Die Abhängigkeit der Insecten von ihrer Umgebung. pp. 107. Leipzig. W. Englemann. A very interesting and suggestive work. An excellent local habitat study from the standpoint of insects. Apparently not known to Dahl (’98, ’03) in his brief outline of the history of ecology. Möller discusses the influence of climate, soil, plants, animal substances and man upon insects, and the influence of insects in the economy of nature. LORENZ, J. R. 1863. Physicalische Verhältnisse und Vertheilung der Organismen im Quarnerischen Golfe. pp. 379. Wien. An early and important study of the habitat and the plants and animals associated in the marine habitats. Apparently but little known. Also not mentioned by Dahl (’98, ’03). VERRILL, A. E. 1873. Report upon the Invertebrate Animals of Vineyard Sound and the Adjacent Waters, with an Account of the Physical Characters of the Region. U. S. Comm. Fish and Fisheries. Rep. on the Condition of the Sea Fisheries of the South Coast of New England in 1871 and 1872. Part I. Senate Misc. Doc. No. 61, 42d Cong., 2d Sess., pp. 295-778. An early descriptive associational and habitat study of the marine animals of our coast. A kind of work, in its standpoint, far in advance of the times. It is remarkable that this well-known work has not been a model for other similar studies on our coast. DAVENPORT, C. B. 1903. The Collembola of Cold Spring Beach, with Special Reference to the Movements of the Poduridae. Cold Spring Harbor Monogr. II. pp. 32. An excellent study of a single group in a habitat, and its relation to behavior. 1903_a_. The Animal Ecology of the Cold Spring Sand Spit, with Remarks on the Theory of Adaptation. Decennial Pub. Univ. Chicago, Vol. X, pp. 157-176. An associational study of a sea beach. PETERSEN, C. G. JOH., and JENSEN, P. B. 1911. Valuation of the Sea. I. Animal Life of the Sea-Bottom, its Food and Quantity. Rep. of Danish Biol. Sta. to Board of Agriculture, Vol. XX, pp. 1-76. Transl. from Fiskeri-Beretning for 1910. Copenhagen. The sea-bottom animals are studied as a community. The most important study of the kind known to the writer. Similar work should be done in American waters. WARMING, E., WESENBERG-LUND, C., and others. 1904. Sur les ‘vads’ et les sables maritimes de la mer du nord. Kon. Danske Vid. Selsk. Skrift., Bd. VII, R. II, pp. 48-56. The sandy flats of the sea coast of Jutland and Holland are treated as a biotic association, and from a modern ecological standpoint. BAKER, F. C.