Described is the construction and use of an apparatus which applies liquid displacement to the problem of volume determination, giving accurate and repeatable results within 0.1 ml of actual volume measured. The apparatus is easily made from two jar parts, two bottle parts, and a burette. (Author/MA)

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)

Lists some materials from Australia, Britain, New Zealand, and the United States appropriate for elementary-aged students and provides comments on the usefulness of these materials. (GS)

Gives a numerical example of the steady-state assumption, using three calculations for the free radical decomposition of methane. (MLH)

Discusses the sampling and data-collection techniques used to study the heights, intelligence levels, and aggression levels of XYY and XXY males. (MLH)

The purpose of this article is to focus attention on published lists of recommended books and periodicals for libraries serving undergraduate students in the sciences. The lists cover biology, chemistry, mathematics, and physics. (13 references) (Author/SJ)

Several examples of self instructional science material for primary and middle schools are presented here. (BB)

A large scale exchange is suggested of successful pieces of written instructions and written material for students. Physics teachers should choose materials which are capable of direct assimulation by the pupils after very minor alterations and additions to suit each individual and locality. (DF)