This paper provides a guide to the minimum size of treatment groups, inferred from the relationships between pupil norms and norms for class averages of standardized achievement tests. (Editor)

Research supported by the National Institute of Child Health and Human Development. (DD)

Research supported by a grant from the National Science Foundation to the University of Texas at Austin. (DD)

Revised version of a paper presented to the Canadian Linguistic Association Annual Meeting, Montreal, Quebec, 1972; research partially supported by the Canada Council. (DD)

Describes the commercial applications of hydroponics, and then outlines ways in which this soilless plant culture method can be used in the science classroom and laboratory. Gives directions for making a suitable growth solution, and suggests appropriate student experiments involving hydroponics. (JR)

Discusses two sampling methods used to evaluate ambient air: the bubbler technique and the use of static samplers. Indicates that vegetation is also excellent indicator of air pollution effects. (CC)

Discusses implementation and advantages of take-home experiments, including three respective examples in acoustics, magnetism, and optics. The activities can be categorized into demonstration experiments, see-what-you-can-find-out'' experiments, and experiments requiring preparatory class discussion or written directions. (CC)

Research supported in part by a United States Public Health Service Grant from the National Institute of Mental Health. (VM)

Report from the Wisconsin Research and Development Center for Cognitive Learning, supported in part as a research and development center by funds from the United States Office of Education, Department of Health, Education, and Welfare. (VM)

Research part of a Senior Honors Thesis submitted to Kent State University by Patricia Sorce, who was a National Science Foundation Undergraduate Research Participant while conducting this research. (VM)