Describes an engineering course that stresses various philosophies and methodologies of experimentation, along with the techniques of experimental synthesis. (MLH)

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)

The use of the earthworm as a laboratory animal for studying the effect of starvation on nitrogen metabolism is discussed. Simple techniques and methods are presented allowing in vivo physiological responses to be compared with changes in the enzyme potential of gut tissue. (Author/MA)

Reports an experiment demonstrating the existence of the oscillatory phenomenon in the manganese +2 catalyzed reaction between citric acid and potassium bromate. (SL)

Reports on an organic chemistry laboratory experiment of the bromination and nitration of benzene to illustrate the nature of electrophilic aromatic substitution reactions. (SL)

Describes an advanced physical or inorganic chemistry experiment in determining the rate law of chemical reactions which demonstrates unusual behavior of k-obs. (SL)

Describes an introductory photochemistry experiment using the ohotohydration of pyridine in aqueous solutions to illustrate many physical aspects of photochemistry. (SL)

Describes an experimental demonstration of entropy utilizing a rubber band. (SL)

Describes an experiment demonstrating the frustration of totally reflected visible light. (SL)

Describes procedure for making X-ray photographs on Polaroid 3000 black and white roll film. (SL)

Presents a set of laboratory experiments that can assist students in the detection of carbon dioxide. Offers a variation of the supported drop method of carbon dioxide detection that provides readily visible positive results. Includes background information on carbon dioxide. (ML)

Describes a relatively simple method of extraction and purification of bacterial DNA. This technique permits advanced secondary-level science students to obtain adequate amounts of DNA from very small pellets of bacteria and to observe some of its polymer properties. (ML)

Described is a physics experiment which investigates the reactions occurring when a hot dog is fried or broiled. (SL)

Discusses five experimental methods used by senior high school students to provide an accurate calibration curve of magnet current against the magnetic flux density produced by an electromagnet. Compares the relative merits of the five methods, both as measurements and from an educational viewpoint. (JR)

Briefly outlines the theoretical basis of the phenomenon of photoconductivity and describes a simple experiment which demonstrates the photoconductive properties of cadmium sulfide. (JR)