Lists laboratory instruments and equipment and the names, addresses and telephone numbers of their manufacturers. Manufacturers are listed in alphabetical and numerical order. (GA)

This article discusses the origins and relative abundance of the elements, the factors that determined the chemical composition of the earth, and nucleosynthesis in the stars. (Author/BB)

This study explores the acquisition of proportionality by investigating the relationship between an understanding of proportionality and the development of cognitive structure in the domain of mechanics. (Author/MA)

Describes some science apparatus: included are a gene kit to demonstrate aspects of population genetics and selection, an electronic thermometer for use in the field of environmental studies, an astrobrella to use in astronomy classes, and crystal display models of different substances for chemistry classes. (GA)

Discusses the potential and feasibility of future widespread exploitation of the vast geothermal energy resources, that could greatly reduce the need for other forms of energy resources. (GA)

Describes a certain procedure, devised by the instructor, to speed up his grading of homework assignments for a general physics course. (GA)

Explains the function of a central heating system and calculates the total heat energy required to heat a house. Estimates annual heat requirement and amount of fuel needed. Gives detailed calculation of heat required for a particular house as an example. (G A)

Describes how to construct a simple on-axis hologram designed to illustrate the reconstruction of images in terms of Fresnel zone plates and gratings. (GA)

Discusses the vibrations of a linear triatomic chain and shows that the addition of the third atom gives rise to an extra optical branch. The nature of the normal modes in ionic crystals and molecular crystals is also discussed. (GA)

Describes the design of a sequential switcher to be used for multichannel strip-chart recordings of temperatures at different points in a solar heated building. (GA)

Presented is the prepared text of a public lecture given by the president of the National Academy of Sciences. Dr. Handler attempts to articulate the state of science today. He deals with such issues as nuclear power and genetic engineering. (MDR)

Discusses fuel cell principles and technology. Reviews areas of needed research and development in order to develop fuel cells into a major energy source. (SL)

Presents a summary review of 36 introductory college level astronomy textbooks for nonscience majors. References to more detailed reviews published elsewhere are provided where they exist. (SL)

Reviews the areas of laser chemistry, photochemistry, infrared lasers, and laser induced molecular reactions. (SL)

Reviews recent developments in the fields of ultraviolet lasers and rare gas lasers. (SL)