For teachers in search of an easily obtainable, readily dissectable, and unique living specimen to arouse the interest of their students and illustrate important biological principles, lichens are the perfect selection. Background information and experiments on lichen anatomy, physiology, and chemistry are given. An appendix gives culture media.…

Exercises are presented for classification of marine algae on the basis of biochemical characteristics such as pigmentation, cell wall components, and food storage products. (BB)

Describes some laboratory apparatus, chemistry experiments and demonstrations, such as a Kofler block melting point apparatus, chromatographic investigation of the phosphoric acid, x-ray diffraction, the fountain experiment, endothermic sherbet, the measurement of viscosity, ionization energies and electronic configurations. (GA)

Explains some middle school science demonstrations and experiments: included are a simplified circuit board, a scheme for the identification of plastics, a soot-free bunsen burner, science in a packet of cornflakes, and perceptual ambiguities with a "Chinese Compass." (GA)

Describes curriculum used by the Chemistry Department at the American University of Washington, D.C. in preparing and implementing a program to update two groups of women in order to prepare them to enter graduate school or return to the job market in chemistry. (HM)

Presents an undergraduate physical chemistry laboratory experiment describing the measurement of the proton magnetic resonance spectra. (HM)

Describes the use of sound/slide programs in instruction, how to produce them locally, and the hardware involved. (GA)

Establishes the extent to which practical work in South African high schools varies with respect to factors such as gender of student, type of school, medium of instruction, and examination board. Investigates the relationship between experience of experimental work and pupil attainment as measured by matriculation grade. (Author/GA)

This experiment uses a nine-chambered plexiglas unit to facilitate rapid construction of galvanic cells and measurement of cell voltage. Using this procedure, a pair of students can construct and obtain the cell voltages of two precipitation cells, three concentration cells, and six redox cells in 30-40 minutes. (BB)

The observation of soap bubbles in a beaker of carbon dioxide gas helps students to feel the pleasure that comes from understanding nature, from applying that understanding to real problems, and from making unexpected discoveries that yield to analysis. (Author/BB)

Tracing the ten-year development and operation of a training center for Florida's law enforcement officers, this article discusses the construction plans, the new training center, the professional staff, and the current programs and objectives. (BM)

The author taught in an open-space classroom at Argyle Junior High in Montgomery County, Maryland. Here is a candid look at the inner workings of a room without walls. (Editor/RK)

Describes a series of science activities involving dissection and analysis of a sea necklace. (CP)

Describes an experiment for the measurement of the reflectances of dielectric surface. The experiment is analyzed in terms of the Stokes parameters and the Mueller calculus, and Malus law is derived. The experiment also provides an introduction to the properties of real linear polarizers. (Author/GA)

Describes an experiment in which a point source of light, when viewed through a cylindrical tube having reflecting inner walls, appears as a series of sharply defined rings, due to the multiple reflections from the inner walls of the tube. ( GA)