Ideas are proposed for physics teachers to use in their classrooms. Subjects include: alpha particles, spectrometer experiments, refractive index of glass, measurement of surface tension, projectile motion, and radiant heat. (PS)

Describes a class investigation as to why scale insects (Family Coccidae) should attack only one of three liquid amber trees on the school grounds. (JR)

Discusses the planning, construction, use, and maintenance of a nature trail. Ideal for demonstrating interrelationships between plants and animals, conservation practices, wildlife management, plant succession, forestry, geologic features and other scientific phenomena. (JR)

Describes eighteen ways in which balloons may be used as a teaching tool in demonstrations and discovery exercises in science. (JR)

Includes a simple technique to demonstrate Millikan's oil drop experiment, an environmental studies experiment to measure dissolved oxygen in water samples, and a technique to demonstrate action-reaction. Science materials described are the Pol-A-Star Tomiscope, Nuffield chemistry film loops, air pucks and pH meters. (JR)

Discusses the practice of assigning questions from different publications each week as part of regular homework in a two-quarter instrumental analysis course. Concludes that students not only acquire factual knowledge but also experience the utilization of literature sources from this training. (CC)

Describes a technique for comparing the number of bacteria in various soil samples. The equipment and materials are readily available, and the technique is suitable for high school students. (JR)