An Osmette A model 5002 automatic osmometer is used to characterize different drugs, diluents, and adulterants commonly encountered in samples of forensic interest, permitting rapid determinations with good reproducibility and use by large numbers of students with little training. Includes background information, procedures, and typical students…

Discusses field collection, preservation and storage techniques, and identification of slime molds (with fruiting bodies). (DC)

Described are the advantages of using crayfish in an elementary or secondary biology class, crayfish activities, field collection, classroom care, and identification. (DC)

Examines various forms of pure skills and skills combination laboratory testing developed at the Geddes Language Center (GLC) of Boston University during the past 10 years. Discusses suggestions for refinements and basic testing principles for each format, based on an evaluation of oral/aural exams on file at GLC. (MES)

Discusses the problem of ellipticity in the motion of the ordinary Foucault pendulum and the error caused by it. Presents a simple method of slightly modifying the force-displacement relation in such a way that precession does not result from ellipticity. (Author/SK)

This is an announcement of a series of small booklets produced by the Science Teaching Project of the Curriculum Development Centre in Australia. Each booklet is designed to be of practical assistance to science teachers and guidance for the classroom situation. (CS)

Discusses the nature of light-producing reactions and provides a procedure for demonstrating chemical luminescence using siloxene indicator. Indicates source of this chemical and safety precautions. (SK)

Suggests ways in which chemistry professionals, particularly academic faculty members, might improve the image of chemistry and engineering. Stresses damage done to this image because of recent media coverage regarding misuse and improper disposal of chemicals. (CS)

During the late sixties and early seventies a new nontextbook, lab-centered approach was used in science instruction in elementary grades. With the arrival of the eighties, science curriculum has come full circle, and new science textbooks with corresponding curriculum guides are being adopted. (JN)

Discusses the use of toys to teach physics. Potential advantages and disadvantages of using toys in the physics classroom or laboratory in addition to some demonstrations and experiments that use balls, cars, and musical toys are also presented. (HM)

Describes how some experiments in physics can be presented in class using cheap materials. How to produce an electrostatic charge using a polythene bottle and how to make a tissue paper electroscope using a tin can are among the experiments described. (HM)

The authors state that organizational development (OD) consultants are reluctant to rely upon instruments because this would diminish their sense of usefulness. They discuss 15 OD issues and conclude that OD instruments must be based on sound principles of behavior and sequenced in a planned way in order to implement organizational change and…

Discusses the reasons for growing disenchantment with the language laboratory and introduces a novel approach to advanced listening comprehension exercises based on recordings of professional entertainers. Analyzes the sketches as examples of authentic discourse, as illustrations of different speech registers and regional variants, and as vehicles…

Discusses the use of and recommends a new direction for laboratory work within the context of teaching human ecology for science and social science teachers and compares traditional and human ecological approaches to science laboratory work. (CS)

Describes an apparatus and procedure for conducting an undergraduate laboratory experiment to quantitatively study the Hall effect in a plasma. Includes background information on the Hall effect and rationale for conducting the experiment. (JN)