Deals with the conversion of electronic hand calculators to timing devices. This article illustrates a conversion of a rather versatile calculator by means of simple and inexpensive circuitry. (HM)

The chemical system of rubbery elasticity is presented. Several references are given from which to extract experiments and problems for students. (SA)

Detailed descriptions are given of two procedures for measuring the radius of the earth, one using a rule and the other a stopwatch. (MP)

Discusses new experiments that are being designed to solve the solar neutrino problem and determine the power source of the sun. (HM)

Describes the use of ethyl or methyl ethanoate mixed with trichloromethane to illustrate intermolecular forces and deviations from Raoult's Law. (MLH)

Describes an undergraduate experiment in which Gantrez AN polymer chains are crosslinked at the anhydride groups by the addition of the hydroxyl groups of triethanolamine, which also acts as a basic catalyst. (MLH)

Describes an experiment in which metal compounds, such as anhydrous oxides, are placed into a glass tube which is heated until the metal colors the glass. (MLH)

Describes a study of the kinetics of the recombination of nitrogen atoms in which concentration-time relations are determined directly by utilizing visual observations of emissions to make gas phase titrations of N atoms with NO. (MLH)

The main finding of these four experiments was that the strong conditioning produced by a brief exposure to a truly random control weakened with prolonged exposure. (Author/RK)

Attempts to evaluate the hypothesis that rats are more hesitant to ingest novel-flavored substances while they are under the influence of a toxic agent than in the normal state. (Author/RK)

Two experiments were conducted in order to investigate the relationship between memory for individual sentences and memory for the holisitic ideas conveyed by those sentences. (Editor)

Three experiments evaluated the effect of poststimulus distractor characteristics in altering recognition of random shapes. (Editor)

Three experiments are reported investigating whether the decreasing recall over trials in the Brown-Peterson paradigm--proactive inhibition (PI)--derives from encoding or storage (availability) differences between items or from retrieval (accessibility) differences. (Editor)

Lists materials and methods for an experiment that demonstrates the concept of glomerular filtration rate (GFR) using anesthesized dogs. In the dog, GFR is equivalent to the renal plasma clearance of exogenous creatinine. (CS)

Describes an experiment using rats that demonstrates contractile characteristics of normal and hypertrophied muscle. Compensatory hypertrophy of the plantaris muscle is induced by surgical removal of the synergistic gastrocnemium muscle. Includes methods for determination of contractile properties of normal and hypertrophied muscle and…