A computer program which simulates an interstellar gas and dust cloud has been used to study Kirchhoff's laws of spectral analysis in introductory astronomy courses. The model parameters can be varied to stimulate various effects observed in actual clouds. Students are given exercises to use the program in a manner similar to a lab experiment.…

Describes the construction of a direct-reading inertial balance that works on the same principle as that used by astronauts in space when weightless. It is used to help demonstrate and measure inertial mass. (GA)

It is suggested that the work of Kammerer provides suitable material, in the form of case studies on which to base discussions of Lamarckism versus Darwinism. A set of structured problems is described as an example of possible problem-solving exercises, and further experiments to extend Kammerer's work are outlined. (Author/MA)

Methods are described for the induction and identification of respiratory deficient mutants in yeast. Practical schemes are given to enable students to obtain dose-response information for physical and chemical mutagens such as heat, ultraviolet light, or acriflavine. A simple test for environmental mutagens is described. (Author/MA)

The rhizosphere is the area directly surrounding the roots of a plant and an area of tremendous microbial growth. This article described techniques for studying this soil biome. Illustrations are included. (MA)

Describes an experiment used to demonstrate the relationship among hypertonic, hypotonic, and isotonic solutions and provides and open-ended research opportunity for additional individual investigation by students. (Author/MA)

The basic physical principles of dye lasers are discussed and used to analyze the design and operation of tunable dye lasers pumped by pulsed nitrogen lasers. Details of the design and construction of these dye lasers are presented. Some simple demonstration experiments are described. (BB)

Indicates some of the information that may be obtained from a binary solid-liquid phase equilibria experiment and a method to write a computer program that will plot an ideal phase diagram to which the experimental results may be compared. (Author/CP)

Describes the laboratory procedure suitable for an introductory organic chemistry procedure. (CP)

Discusses an experiment involving a linear chain of falling dominoes. The time for a chain of N equally spaced dominoes to fall is measured and a plot is made between the time and N. The experimental data are compared with the predictions of theory. (Author/GA)

Describes an experiment to verify the Compton collision formula and the angular dependance of the Klein-Nishina formula. Equipment used is a 1-mCi(137)Cs source, 2x2 in. NaI detector and a multichannel analyzer. Suitable for honor undergraduates. (Author/GA)

Presents an experiment for a physical chemistry course designed expecially for students majoring in the life sciences. (SL)

Describes an apparatus and experimental procedure for quantitatively evaluating the activation energy associated with annealing color centers in glass. (MLH)

Research is reviewed which demonstrates the existence of reverse discrimination (majority group members treating other majority group members worse than they treat members of a minority group) and tokenism (a decrease in subsequent compliance to large interracial requests) following prior compliance to smaller requests. Within subject evidence…

The types of notes provided for postgraduate demonstrators to help them teach effectively in the laboratory are described. Notes have been written at the University of London for four laboratories, in some cases permitting permanent academic staff to be replaced almost entirely by the demonstrators. (LBH)