Describes the making of artificial urine for laboratory experiments which supplies all the major properties of human urine. (MKR)

Presented is the index to the January-December 1976 issues of The Science Teacher (Volume 43). Both author and title indexes are included. (SL)

Presents important principles and issues related to postpositivism including logic of confirmation and logic of falsification. Discusses possible applications in science education. Lists 23 references. (YP)

Presents three lapidary activities which have been developed to teach enrichment courses to adults and young people. Described are activities and materials for polishing and shaping rocks. (EB)

After discussing the ease of using the Fry Readability Graph, the author applies it to biology, chemistry, and physics texts, and lists the results. He warns that textbook authors and classroom teachers should be aware of the potential impact that the reading level of a text can have on students. (KC)

Suggests a way of distinguishing between the two classes of chemical reactions of the lanthanide series. (CS)

Describes how teachers and students can construct a mass, spring scale, lever, and pulley. (ZWH)

Provides background information for teachers on the physical and physiological characteristics of fruit flies. Explains their role and function in the study of heredity. Upholds their value as a manageable and safe laboratory animal. (ML)

Describes an approach to the study of entomology directed at people with no special knowledge of insects. The aim of this approach is to reveal some biological principles by studying insects from an ecological point of view. (GS)

Discussed is the accuracy of three statements commonly used in chemistry books and in teaching chemistry. (HM)

Discusses the distribution of kinetic and potential energy in transverse and longitudinal waves and examines the transmission of power and momentum. This discussion is intended to aid in understanding the simple harmonic motion of a particle involved in the propagation of a harmonic mechanical plane wave. (HM)

Compared is the mass of a dozen eggs with the mass of air in an empty refrigerator. An answer and reasons for the answer are provided. (YP)

Lists 46 household chemicals readily available at local stores by common name, chemical name, chemical formula, and typical commercial source. Suggests that school budgetary constraints can be eased by this practice and that students can become more chemically literate as consumers. (JJK)

Diagrams and photographs are incorporated in an explanation of the physics involved in the skills of diving and swimming. (CP)