Short articles describe techniques suitable for junior high school science, including the use of a toy drinking bird" to start discussion, using cobalt chloride solution to demonstrate convection currents, demonstration of the relationship between freezing point and concentration, and instructions for building a simple lens camera, a circuit…

Describes a mathematical treatment that can be used to convince students of the efficiency of correct washing methods for chemical apparatus and precipitates. (AL)

Describes techniques for the preparation of simple soaps and detergents that can be used, by students, to investigate their properties and the differences between the two classes of compounds. (AL)

An experiment is described to determine the horsepower rating of students running up a flight of stairs. (DF)

Describes an approach to teaching the Hardy-Weinberg Law in high school genetics class. Instructional procedures used help in developing this concept in broad generalization form rather than merely a mathematical model of a gene pool. (PS)

Describes a procedure useful for investigating the effects of substances on plant growth and development. A bean seedling's stem is partially split, and each half is placed in a different nutrient solution. Suggestions for the instructional use of the technique are made. (AL)

Describes the results of a study of the ecology of the bean plant/aphid/ant/associated insects/fungi system and suggests a series of experiments that secondary school students could undertake by observing or manipulating this system. (Species recorded are British) (AL)

Discusses the advantages of using reptiles in biology and elementary school classes, describes demonstration techniques used by the author, and suggests some student activities using reptiles, especially snakes and lizards. (AL)