Translated from the German by W. D. Halls.

Describes an optical cell, suitable for high-pressure studies between at least -130 and +150 degrees Celsius, which may be assembled for about $50. Discusses experimental demonstration of principles involved when using the apparatus, including effects of pressure on coordination of ions in solution and on reaction rates in solution. (JN)

The theme articles present strategies for achieving quality laboratory projects in vocational agriculture. They describe fundamentals of the construction of quality projects and stress the importance of quality instruction. (JOW)

Provides additional information on a demonstration described in the March 1981 issue of "The Physics Teacher" involving free-falling objects using styrofoam cups, rubber bands, and weights. Approaches the subject using free-body diagrams (included) and discusses the mechanism by which the weights are pulled into the cup. (JM)

Discusses the Rugby clock as a source of project material, use of ZX81 for experimental science, computer dice analog, oil recovery from reservoirs, and computer simulation of Thompson's experiment for determining e/m for an electron. Activities/procedures are provided when applicable. Also presents questions (and answers) related to time-coded…

Describes a procedure used to optimize instrument performance as taught in a fourth-year undergraduate instrumental analysis course. Gives rules for fixed and variable size simplex and discusses calculations. Also explains use of computer simulation of instruments as a tool in teaching the simplex technique. (JM)

Describes how to input and output through the game ports of the Atari microcomputer to control experiments and collect data in the science laboratory. Indicates that the simple techniques described are easily transferred to other microcomputers. (JN)

Discusses ATP synthesis in mitochondria/chloroplasts and cause of an antipodal high tide. Also discusses a simple field experiment on regulation of osmotic potential by Salicornia (pioneer plant of estuarine sale marshes) and use of a key to identify British mosquito larvae. The latter includes procedures for collecting, recognizing, and finding…

Describes experiments on diffusion of gases, volumetric approach to water of hydration, and toxicity of chemicals in the laboratory. Also describes an inexpensive automatic pipette, overhead projection of chemical reactions, and an alternative method for demonstrating flame tests. (JN)

Sedimentary patterns and hydraulic effects can be studies in model streams which are not to scale. The "Western River" is such a model which is being used effectively at Western Carolina College. Construction of the model, student exercises, and observations made when using the model are discussed. (Author/JN)

Discusses microbial production of methane from biomass. Topics include methogens (bacteria producing methane), ecology of methanogenesis, methanogenesis in ruminant/nonruminant and other environments, role of methanogenesis in nature, and methane production in sewage treatment plants. Also discusses construction of methane digesters (and related…

Describes computer program (HUMAN) used to simulate physiological experiments on patient pathology. Program (available from authors, including versions for microcomputers) consists of dynamic interactions of over 150 physiological variables and integrating approximations of cardiovascular, renal, lung, temperature regulation, and some hormone…

Traces the history of physiology at the University of Michigan, focusing on facilities, curriculum program and instruction, classic experiments, and faculty. Contributions of Henry Sewall and Warren Plimpton Lombard are discussed at some length. (JN)

Outlines the objectives, materials, and procedures in performing a student laboratory experiment that demonstrates sodium transport in frog skin. (CS)