At all levels of instruction commonplace items such as fruit, gelatin, golf and tennis balls, and sugar cubes can be used to demonstrate geographic concepts such as earth-sun relations, locative grid, structure of the earth, glaciation. Tactile and visual demonstrations in which students participate are more effective than other alternatives. (NH)

Discusses the role of laboratory work in biology and suggests reasons (mostly related to the preparation of teachers) for the continuing emphasis on confirmatory laboratory exercises rather than student directed investigations. Gives examples of process and affective objectives, and practical suggestions for using behavioral objectives to guide…

Undergraduate engineering students should become intimately involved in three principal dimensions of engineering: analysis, synthesis and experimentation. (Editor)

To assess the ability of current analytical methods to approach the single-atom detection level, theoretical and experimentally determined detection levels are presented for several chemical elements. A comparison of these methods shows that the most sensitive atomic spectrochemical technique currently available is based on emission from…

Major instrumental concerns in molecular solution fluorimetry have recently turned away from sensitivity enhancement to an orientation more directed toward selectivity. This trend simply recognizes that such methodology has historically been blank limited. Thus, the described uses of liquid chromatography, line narrowing, and time resolution…