A discussion of Edwin Land's experiments with color images from black-and-white photographs. Information is presented for duplication of these experiments by the amateur photographer. (BB)

Discusses the existence of spirals in nature in general, supplying many examples, and explains how a particular organism, Phycomyces, accomplishes this feat. (GA)

Describes the following: a low-pressure sodium light source; a design of hot cathodes for plasma and electron physics experiments; a demonstration cart for a physics of sound course; Bernoulli force using coffee cups; a spark recording for the linear air track; and a demonstration of the effect of altering the cavity resonance of a violin. (GA)

Explains how to use glass tubing to form a simple microscope; how to construct an over-voltage protection circuit; and how to demonstrate electromagnetic effects with a coil and rubber bands. (GA)

An activity is described that is designed to give students a chance to learn about speed by calculating their own running or walking speed and the speed of cars. (MP)

Discusses the determination of the position of the absorption maximum in wide bands as well as the confidence limits for such calculations. A simple method, suited for pocket calculators, for the numerical evaluation of these calculations is presented. (BB)

Describes process-based practical work used in Scottish high school examinations and evaluates this work against a standard of course objectives for practical work in general. (MLH)

Discusses how students can investigate the relationship between the current and the voltage across a field coil by using a current that has a triangular waveform. (MLH)

Three experiments, employing conditioned suppression in rats, examined the extent to which pretraining on one element of a compound stimulus blocked conditioning to the other element when some feature of the reinforcer was changed on compound trials. (Editor)

The research reported here was directed at evaluating whether or not the effectiveness of a Pavlovian unconditioned stimulus (US) in promoting associative learning is reduced if the US is shortly preceded by another occurrence of the same US. (Author)

Discusses a teaching program for introductory chemistry laboratories that allows for differences in student background and ability. The flexible program involves self-pacing and a classification of experiments; this permits slower students to proceed through remedial loops while advanced students proceed to more difficult experiments. (MLH)

Describes an interpretative experiment involving the application of symmetry and temperature-dependent proton and fluorine nmr spectroscopy to the solution of structural and kinetic problems in coordination chemistry. (MLH)

Investigates the effects of medium, task, and instruction on the child's representation of the human figure, the origins and course of development of the child's representational effort, and the effects of socioeconomic status (SES), intelligence, age, sex, and mental retardation on the representation of the human figure. (Author/RK)

Recent data indicate that the form of the conditioned response (CR) may often be substantially influenced by the characteristics of the conditioned stimulus (CS) as well as by those of the unconditioned stimulus (US). Here five experiments examine the influence of CS characteristics on the form of the Pavlovian CR anticipatory to a food US in…

Sought to elucidate the nature of odor memory by applying paradigms from verbal learning and semantic memory and to investigate two processes affecting paired-associate performance. (Author/RK)