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)

Recommends that teacher and student be provided with the broadest possible spectrum of meaningful and feasible experiments in which the comfort of the experimental animal is protected by the design of the experiment. (BR)