Care and maintenance of snails are described. (BB)

Four examples are given of spectra of organophosphorus compounds which show students how the effects of phosphorus are delt with in nmr spectroscopy. (BB)

Two demonstrations are presented: a verification of the discontinuity of matter based on the law of definite proportions, and a series of consecutive chemical reactions featuring reversible equilibria. (BB)

Describes a simple conductivity apparatus for the determination of ionization and solubility product constants of various substances. The uses of the apparatus in determining the ionization constant of a weak monoprotic acid and in measuring the rate of diffusion of ions through a membrane are also presented. (HM)

Discusses a laboratory experiment in isotope production designed to help the students understand some of the concepts in elementary nuclear physics. (GA)

Simple activities are described which use paper clips and straws or a board to demonstrate the properties of the lever. (BB)

This article describes how a gas chromatograph may be used to determine the amount of carbon dioxide in exhaled air. The experiment has been used as part of a demonstration exercise at a local science fair and proved of interest to all age groups. (Author/BB)

Examines the practice of holding competitive science fairs. Offers suggestions on judging, competition and recognition, student participation, and alternative experiences. (MA)

Inquiry is defined here as the scientist's method of problem solving. Presents a bent wire phenomenon activity designed to engage students in the active process of solving a problem in science. A model is proposed to explain the phenomenon. (MA)

Describes a laboratory exercise using relief models, aerial photographs, topographic maps, and cone studies to determine depth and thickness of a concealed mineralized zone. (MA)

Describes an open-ended laboratory project suited to science materials. The students are asked to determine the structure, the properties and possible applications of a commercial material that is being developed and supplied by the manufacturer. (GA)

A simple experiment is described to measure the diffusion coefficient of a solute in a fluid. Laboratory-made floats are used to monitor the density changes associated with diffusion behavior. The experiment is ideally suited for undergraduate project work. (BB)

The fourteen-year life story of a sealed terrarium is presented. (BB)

Describes a demonstration concerning the air pollution aspects of gasoline vapor which provides an estimation of the vapor pressure of test fuel, the molecular weight of the vapor, and illustrates a method of controlling the pollution. (SL)

Presents seven topics suitable for a secondary level introduction to geochemistry. (SL)