Describes three accessories developed to be used in conjunction with the rotating platform or turntable. Three demonstrations using these accessories are included. These demonstrations are: (a) conservation of angular momentum; (b) gravity-defying goblets; and (c) direct measurement of centripetal force. (HM)

Presents two methods for measuring the index of refraction of glass or lucite. These two methods, used in the freshman laboratory, are based on the fact that a ray of light inside a block will be refracted parallel to the surface. (HM)

Discusses a study undertaken to assess the effect of graduate student teaching assistants on undergraduate students' attitudes toward psychology in an introductory psychology laboratory course. Findings indicated that good TAs convey more positive feelings about the labs than do poorer TAs. (DB)

This experiment demonstrates the polarization properties of the transition moment, vibronic activity in an excited state, cyrogenic techniques, crystal site splitting, and the use of mixed crystals. (BB)

Described is a cardiovascular simulator which illustrates the use of a catheter-coupled external transducer for dynamic pressure measurements in the circulatory system. With the simulator, students can observe the effects of stroke volume and rate upon maximum, minimum, and mean arterial pressure. (Author/GA)

Advocates teaching of organic reaction mechanisms through the methods which are used in elucidating them. This also provides a useful way of illustrating the theories and methods of physical chemistry. Describes an approach to teaching three reaction mechanisms: substitution in alkanes; addition to alkenes; and ester hydrolysis. (Author/GA)

Discusses a laboratory experiment, using the single-photon counting technique, to determine the fluorescence spectrum of NaI(T1) crystal under gamma excitation. (Author/GA)

Describes a simplified version of New's method for culturing early chick embryos. The technique allows continuous observation of the critical first three days of development and the conditions for setting up successful cultures are also presented to help both teachers and students. (HM)

Investigates processes leading to a rationale for designing a teacher's manual. A sample of 45 teachers was used to give feedback information before, during and after teaching a newly developed laboratory block in genetics for the eleventh-twelfth grade level in Israel. (HM)

Factors that influence the efficiency of laboratory experiences include: size of laboratory group, length of session, discussion, special tools, and applications of knowledge learned. It is suggested that these variables may be altered to insure that students gain from their time spent in the laboratory. (BH)

Provides a guide for setting up learning centers in easily handled stages. Discusses six stages in the development of individualized instruction through the use of learning centers and offers specific guidelines for using this technique for facilitating instruction. (FL)

Proposes a method to be used in the language laboratory to develop audiolingual skills and at the same time give the student an active role in the use of the laboratory. (AM)

Ideas intended for use in a high school biology laboratory are given. Swordtail fish are described as subjects for observation in animal behavior studies. (SA)

Discusses fire safety and fire control in the chemistry laboratory. The combustion process, extinguishing equipment, extinguisher maintenance and location, and fire safety and practices are included. (HM)

Discusses safety matters in school and university chemistry laboratories and how to maintain clean, pollution-free air in the working areas in chemistry teaching and research laboratories. (HM)