Describes procedures for extracting nematodes from soil and culturing them for study and experimentation. (PB)

Describes laboratory activities for verification of superposition and the Thevenin theorem using Kirchoff's laws apparatus. (CP)

Reports on the international conference on physics education held in Edinburgh, Scotland, July 29 - August 6, 1975. Provides the list of topics discussed by the working groups and notes other activities of the conference. (CP)

Describes a laboratory activity in which polystyrene spheres in two preassembled motifs must be arranged to form a tetrahedral structure. (MLH)

States the procedure for isolating actinomycetes from soil and testing for antibiotic growth. (LS)

Presents the results of an experiment designed to test two hypotheses: (1) a delay of two weeks at room temperature will have no effect on the viability of fertile chicken eggs and (2) refrigeration will have no effect on the viability of fertile chicken eggs. Experimenters were the author and two ninth-grade students. (PEB)

Using a box with a pinhole in one end, the diameter of the sun can be calculated with knowledge of the length of time required for the image of the sun to sweep out a measured arc. (CP)

Describes a Pollution Control Center, established and manned by students, which dispenses environmental information, maintains a recycling center, provides speakers and many other activities. (BR)

Describes the use of balloon models to illustrate chemical bonding in atoms. (BR)

A new system for the experiments on intermolecular forces is presented in the interest of laboratory safety. (GS)