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)

A research internship program for undergraduate college students is described. The program, which emphasizes "hands on" experiences for women students, is evaluated by the use of a follow-up study of the graduates. (SA)

Presented are several uses of the theory of accelerated frames. This approach, which does not require a knowledge of variational or energy methods, is intended for undergraduate students taking a first course in mechanics. (HM)

Discusses the results of a survey on process control education which was conducted in the United States and Canada in 1978. Process control courses and textbooks at the undergraduate and graduate level are included. (HM)

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)

Two demonstrations are described: (1) a variant of preparing purple benzene by phase transfer catalysis with quaternary ammonium salts and potassium permanganate in which crown ethers are used; (2) a corridor or "hallway" demonstration in which unknown molecular models are displayed and prizes awarded to students correctly identifying the…

The separation by high performance liquid chromatography of five common dyes from foods containing "artificial color" is described. (CS)

Describes an experiment which illustrates the general aspects of intermolecular energy transfer between triplet states in rigid solutions of organic compounds solved in an ethanol-ether mixture. Measurements of quenching and energy transfer processes are made using the chemicals of benzophenone and naphthalene. (CS)

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)

This paper, presented at the McMaster International Conference on New Directions in the Chemistry Curriculum, discusses the answers to five questions which deal with basic philosophy concerning new chemistry curricula. (HM)

This undergraduate biochemistry experiment introduces the student to techniques for cell lysis and release of protein from the cell in soluble form, ion exchange and gel chromatography, and dialysis. (Author/BB)

This experiment can be used as either a demonstration or a laboratory activity illustrating the principles of affinity chromatography to purify an enzyme. (BB)

The author derives, applying perturbation theory, from a simple astronomical model the approximate periods of secular variation of some of the parameters of the Earth's orbit and relates these periods to the past climate of the Earth, indicating the difficulties in predicting the climate of the future. (GA)

Described is an easy to assemble, and inexpensive, torsional pendulum which gives an accuracy of measurement of the modulus of rigidity, G, comparable to the accuracy obtained with the more expensive commercially available student models. (Author/GA)

The author explains that, for confining potentials and large quantum numbers, the bound-state energies rise more rapidly as a function of n the more rapidly the potential rises with distance. However, the spectrum can rise no faster than n squared in the nonrelativistic case, or n in the relativistic case. (Author/GA)