Presented is a short discussion of factors causing color changes in animals. Also described is an activity which may be used to demonstrate the response of amphibian skin to a melanophore stimulating hormone in high school or college biology classes. (PEB)

Describes an electronic technique for making a series of timing measurements in quick succession, using the signal from one photodiode. Two undergraduate experiments, one on linear momentum and the other on angular momentum conservation, are included. (HM)

Procedures are described for preparing spores from the fern, water clover, for an educational demonstration of germination and sexual reproduction. The demonstration is recommended for biology instructors who want to illustrate the alternation of phases in plants. (SA)

Presents a recipe for the Nylon Rope Trick, which is considered to be one of the most spectacular demonstrations in chemistry. Materials for growing the polymer and some safety precautions are given. (SA)

Three methods are given for the synthesis of N-4 substituted sulfonamides. An example elucidates the procedures involved in one of the methods. The example is intended as a model for students. (SA)

Presents one of the themes of a French chemistry college laboratory course, which concerns the field of solid state chemistry and is focused on the study of the cation distribution in the case of certain spinel ferrites. (HM)

Discussed are the advantages and disadvantages of two different philosophical approaches, academic or traditional versus experimental, to the laboratory instruction of undergraduate physics students. The defects, failures, and limitations of each approach are detailed. (BT)

Demonstrations of Boyle's Law and of the relationship of gauge pressure and atmospheric pressure are presented. (BB)

This experiment is suitable for illustrating synthesis-analysis and isopolyanion chemistry at the freshman level or at a more advanced level. (BB)

In this general chemistry experiment students calculate changes in free energy of formation of inorganic salts from the free energy of formation of ions. Then they test the conclusions of their calculations by mixing solutions of the ions. (BB)

Discusses the use of lap-dissolve projection to give students pre-laboratory instruction on an upcoming experiment. In this technique, two slide projectors are operated alternately so that one visual image fades away while the next appears on the same screen area. (MLH)

Presents a new approach to an older demonstration involving the reaction of sodium with water. Materials list, procedures, and a discussion of hazard and disposal considerations are included. (DDR)

Describes laboratory techniques designed to familiarize students with meiosis and how microscopic preparations of meiosis are made. These techniques require the use of fresh or fixed flowers. Contains 18 references. (DDR)

Explains the process of establishing a scientific community among students. Specifically addresses questions related to classroom environment, the beginning of the school year, and the types of experiments and activities used throughout the year to enable students to be successful in science. (DDR)

Provides details of experiments that deal with the use of operational amplifiers and are part of a course in instrumental analysis. These experiments are performed after the completion of a set of electricity and electronics experiments. (DDR)