This science study aid, published by the U. S. Department of Agriculture and intended as a supplement to the regular science program, lists activities and experiments relating seed germination to various temperature changes and exposure to adverse temperature conditions for varying lengths of time. (CP)

As a result of work performed at the Southwestern Radiological Health Laboratory with respect to lasers, this manual was prepared in response to the increasing use of lasers in high schools and colleges. It is directed primarily toward the high school instructor who may use the text for a short course in laser fundamentals. The definition of the…

Describes an undergraduate atomic absorption experiment in which the iron and manganese concentrations in dry cat food are determined. (MLH)

Describes an organic chemistry experiment that illustrates dimerization, gas chromatography analysis and separation, and the thermodynamic basis for Markovnikov's rule. (MLH)

Suggests the use of a colorimeter in which heat produced is related to the amperage and voltage measured. In relating the quantities, a definition for voltage can be obtained. (CP)

Describes an inexpensive apparatus used to study the kinetics of fast reactions. Suggests an appropriate reaction for study, and laboratory techniques. (MLH)

Describes ion-exchange methods for the qualitative determination of iron (III), chromium (III), aluminum (III), and manganese (III) and (IV) in the presence of phosphates. (MLH)

Suggests that the anatomy of a green pea be studied as the culminating laboratory activity of a botany unit in a biology course. (LS)

Provides a solution to the Blackwood pendulum experiment by the use of conservation of linear momentum and conservation of energy of translational motion. (CP)

Describes how to assemble a respirometer from common laboratory materials for quantitative measurements of gas production. (LS)

Gives basic instructions for rearing several readily available insect species particularly well suited to use in secondary, and even elementary, school classrooms and laboratories. (LS)

Includes description of a light meter, photometer, fluid flow apparatus, and acoustic grating. (RH)

Describes a chemistry project in which lichens are identified by the analysis of the phenolic substances that they biosynthesize. (MLH)