An information processing model, Memory-Aided Pattern Perceiver (MAPP), that simulates the recall of briefly presented chess positions, was subjected to a test of its assumption that such positions are encoded and stored as chunks in short-term memory. (Editor)

Why does the rehearsal of information not interfere with a subject's temporal judgments. Offers evidence in favor of one possible interpretation. Taking an analogy from the phenomenon of the localization of sound in a sound-reverberating room, this research suggests a precedence effect in verbal information processing. (Author/RK)

These experiments allow a comparison between visual and auditory presentation per se: Will it be easier to identify "red" as relevant given a geometric design or its verbal description? Suggests that visual presentation confers one advantage: allows the formation of a nonverbal code in addition to a verbal description. (Author/RK)

Two experiments using five lists of words were conducted to explore the effects of the concreteness or abstractness of words on their tachistoscopic recognition. (Editor)

Lists materials and procedures for experimenting with detergents. Included are methods for determination of the densities of dry detergents, ph values of detergent solutions, and a discussion of the ability of detergents to remove iodine stains from cloth. (CS)

Presents short articles on: recycling disposable plastics for laboratory use; an inexpensive source of atomic and molecular models; a simplified Boyle's Law demonstration; and a lab demonstrating energy transformation. (MLH)

Describes a scheme that uses precipitation, gas evolution, complex ion formation, and flame tests to analyze for the following ions: Hg(I), Hg(II), Sb(III), Cr(III), Pb(II), Sr(II), Cu(II), Cd(II), As(III), chloride, nitrate, and sulfate. (MLH)

Presents four short articles on: a power supply for the measurement of the charge-to-mass ratio of the electron; a modified centripetal force apparatus; a black box electronic unknown for the scientific instruments laboratory; and a simple scaling model for biological systems. (MLH)

Describes an experiment involving the oxidation of aromatic primary amines to the corresponding azo compound; suggests procedures for studying factors that influence the yield of such a reaction, including the choice of solvent and the oxidant-amine ratio. (MLH)

Discusses the feasibility of analytical experiments that use only spot plates and eye droppers, thus allowing quantitative experiments to be performed with quantitites limited to several milliliters per student. (MLH)

Describes an experiment that involves the synthesis of copper (II) aspirinate and the analysis of copper content in the product using electrogravimetric, spectrophotometric, and titrimetric methods. (MLH)

Presented are accounts of how two local jurisdictions in the United States have dealt with the question of regulating recombinant DNA research. Arguments used to devise guidelines for consideration by the New York State Legislature and the recommendations made by a citizens group in Cambridge, Massachusetts are detailed. (CS)

Reproduced is the report made by a citizens' group in Cambridge, Massachusetts and presented to the city council that outlines safety regulations for the conduct of recombinant DNA research at Harvard University and the Massachusetts Institute of Technology. (CS)

The role of differential rehearsal opportunity in the free recall of remember- (R) and forget- (F) cued words was investigated as a function of the method of presentation. (Editor)

Assesses both individual-to-group and group-to-individual transfer on a concept-attainment task in a between-subjects design with both of the appropriate individual-to-individual and group-to-group controls. (Author/RK)