e | * e = molds. His presentation will include recent evidence from his laboratory concerning the chemical identity and action of “acrasin,” the chemotactic agent which signals the individual, free-living amoebae to aggregate and to differentiate and organize into a multicellular organism. W. John Smith, R. Allen, Beatrice T. Gardner, Vincent G. Dethier Thomas Eisner, and Edward O. Wilson. present new experiments from his laboratory which are Terrestrial Adaptations in Crustacea (27-29 Dec.) findings indicate that the same physical principles which operate to control the self-assembly of macromolecular subunits into higher cell or viral structures also operate to Dedicated to the memory of Warren J. Gross, a leading investigator in the field of crustacean terrestrial adaptations. Malcom S. Steinberg, also of Princeton University, will an extension of earlier experiments by Holtfreter. The guide major steps in the organization of the vertebrate body during embryonic development. Viktor Hamburger, Jane M, Oppenheimer, J. T. Bonner, Theo M. Konijn, Maicoim S. Steinberg, and J. Lawrence Kelland. Refresher Course: Principles of Ecology for Bio-Environmental Engineers (27 Dec.) the neural mechanismsare all being investigated intensively in both vertebrates and invertebrates. Neal A. Weber, Robert Capranica, William F. Martin, Arranged by Dorothy E. Bliss and Linda Habas Mantel (American Museum of Natural History, New York City). The Transition from Water to Land in Three Major Groups. Adaptations Concerned with Osmoregulation and Water Balance. Adaptations Concerned with Temperature, Respiration, and Circulation. Adaptations of Metabolism. Arranged by Rezneat M. Darnell (Marquette University) and Theodore A, Olson (University of Minnesota). Adaptations of Water Conservation and Behavior. Adaptations of Sensory Perception and Behavior. In the past 5 years there has been a marked rise in The community of ecologists is becoming progressively concerned over the impact of civilization upon natural ecosystems. Increasing population pressure, together with expanding technology, are posing threats whose directions interest in the adaptive characteristics of crustaceans that have invaded the intertidal zone and the land above the but on the worldwide scale. Few ecologists, however, are in positions to retard the effects of environmental modification which are becoming so apparentto all. The community of environmental engineers is itself the agent which plans and executes many environmental mod- Mathematics—A. M. Gleason: “Symmetry, the Scientist’s Friend,” 30 Dec. Physics—-W. W. Havens: “Nuclear Physics Research Vice-Presidential Addresses and magnitudes must be assessed, not only on the local, ifications, which provides for the wastes of civilization, and which carries out programs for the assessment of tolerance Jevels for environmental disturbance. Increased communication between the ecologist and the environmental engineer is essential to the optimal long-term management of our limited environmental resources. The present refresher course is an attempt to strengthen this dialogue. Principles of community and ecosystemecology will be presented in some detail and their engineering implications discussed. The community understress will be examined from both ecological and engineering standpoints. George L. Clarke, Robert G. Wetzel, David E. Reichle, Thomas D. Brock, and Frank B. Golley. Eugene P. Odum, George M. Woodwell, Robert H. Whittaker, Richard §. Englebrecht, Willis E, Pequegnat, Stanley I, Auerbach, and Frederick E, Smith. Alfred F. Bartsch, Howard T. Odum, Gordon M. Fair, John E. Cantion, and Conrad P. Straub. Animal Communication (28 Dec.) Arranged by Neal A. Weber (Swarthmore Coilege). Animal communication may take auditory, visual, tactile, biochemical or some combination of forms, both between members of a species or between unrelated species. The organism receives information from the external environment, a signal is made, and the animal perceives it, responding appropriately. The advent of refined instrumentation and morecritical approaches have markedly increased our knowledge of animal communication. The biochemistry of the signals, their origins and methods of transmittal, the receptors, 8 DECEMBER 1967 as a Source of Technology,” 29 Dec. . Chemistry—H. F. Mark: “Are There Limits to Polymer Research?” 27 Dec. Geology and Geography—Joe Webb Peoples: “Geology in State Governments,” 27 Dec. Zoological Sciences—C. §. Pittendrigh: “Time and Life,” 29 Dec. Botanical Sciences—W. C. Steere: “The Evolutionary Position of the Bryophyta,” 29 Dec. Anthropology—Alexander Spoehr: “Anthropology Today,” 27 Dec. Psychology—L. J. Postman: “Mechanisms of In- terference in Forgetting,” 30 Dec. Social and Economic Sciences—David B. Truman: “The Social Sciences: Maturity, Relevance, and the Problem of Training,” 29 Dec. History and Philosophy of Science—P. J. Caws: “Structure, Statistics, and the Logic of Discovery,” 30 Dec. Dentistry—L, R. Cahn: “Global Oral Pathology,” 28 Dec. Pharmaceutical Sciences—Curtis Waldon: “Pharmacy and the Developing Federal Programs,” 29 Dec. Industrial Science—Ellis A. Johnson: “Ethical Dilemmas in the Applications of Operations Research toward the Organizational Behavior of Very Large Systems,” 28 Dec. Education—Herbert A. Smith, “Fallout from a Dec- ade of Criticism in Science Education,” 27 Dec. information and Communication—P. V. Parkins: “Confessions of a Communications Non-Conformist,” 29 Dec. Statistics—G. E. P. Box: “Science and Statistics,” 29 Dec. ‘4 1331 Lei-