Describes how the continuous variation method may be used in senior chemistry classes at the secondary level. This technique allows for the detection of the one or more reactions that may occur in a system over a wide range of composition. (JR)

Presents an outline of current knowledge relating to the response of radicles to a directional source of water (hydrotropism). New techniques are described that may be used in biology classes to demonstrate the hydrotropic response in plants. (JR)

Outlines the advantages of using the readily available eggs of the nematode Rhabditis in studying the early cleavage stages of animal development. Discusses the identification and life history of Rhabditis, how to culture and examine the organism, the cleavage stages and cell lineage, and sources of visual aids. (JR)

Discusses phenomena relating to the nature of soap films and describes soap film experiments suitable for secondary school science students. (JR)

Discusses the importance of ethene (ethylene) in industry and the pipeline grid in western Europe for transporting ethene. Describes methods for investigating organic compounds in school laboratories using ethene as the key compound. (JR)

Discusses holography, a process by which a three-dimensional image of an object can be completely recorded on a photographic film or plate. Introduces hologram theory with a view to presenting it to senior high school students, and explains how the apparently very great experimental difficulties can be overcome. (JR)

Describes animal behavior experiments that can be easily performed by secondary school students. The experiments illustrate territorial behavior, social order, and exploratory behavior in Mongolian gerbils. (JR)

Discusses procedures of using the selective absorption properties of manganese dioxide to prepare a short-lived source from the cerium-144/praseodymium-144 system. (CC)

Describes a method of recording the number of particles scattered at various angles for different impact parameters in an experiment illustrating the Rutherford scattering of alpha particles. (JR)

A simple experiment is proposed that can provide the student with some insight into the chemical properties of solids. It also demonstrates the relationship between the Gibbs free energy of formation of an ionic solid and the emf of an electrochemical cell. (DF)

Discusses training recommendations issued by the Chemical and Allied Products Industry Training Board and the two related methods in use. Emphasizes that the technician job is worthwhile in its own right rather than a step toward the technologist level. (CC)

Describes an experiment designed to expose the student to the classical techniques of organic dye synthesis and introduce him to a variety of modern scientific knowledge and exotic physical phenomena which he might not encounter otherwise. (Author/DF)