Described are embryology experiments demonstrating effects of lithium on the nervous system and the use of hypertonic salt solutions to produce exogastrulation in the eggs of Xenopus laevis. (SL)

Described is the use of analogue computer modules in simulating population ecology. Computer modules demonstrating exponential growth and predator-prey interactions are described and diagramed. (SL)

Described are science experiments which utilize methylene blue to demonstrate the effects of pH, temperature inhibitors, and concentration on enzyme reactions in yeast enzyme systems. (SL)

Suggests and describes laboratory activities in which the Mexican axolotl (Ambystoma mexicanum Shaw) is used, including experiments in embryology and early development, growth and regeneration, neoteny and metamorphosis, genetics and coloration, anatomy and physiology, and behavior. Discusses care and maintenance of animals. (CS)

Describes an exercise that extends the actual determination of the amino acid sequence of a simple dipeptide to the theoretical determination of the complete primary structure of a larger polypeptide. Includes diagrams of display cards and duplicated sheets used in the theoretical portion of the exercise. (CS)

A description of four rapid tests to determine the viability of stored seeds are given. Typical results are reported and some possible applications of the tests are discussed. (Author/EB)

The purpose of keeping animals in schools and problems encountered in their maintenance are summarized. Two curriculum units, one on fruit flies and one on honey bees are described. Reasons for a widespread negative image of rural studies are discussed and positive outcomes of an environmental science course are presented. (Author/EB)

Describes an approach to ecology teaching based on a workbook of structured integrated exercises and in-service courses for teachers. (Author/MA)

Describes the development of an educational nature trail. Discusses objectives, methods of use, and possible evaluation techniques for such a trail. Suggests activites. (Author/MA)

Describes an interactive Fortran computer program which provides an exercise in the identification of bacteria. Provides a way of enhancing a student's approach to systematic bacteriology and numerical identification procedures. (Author/MA)

Presents a description for maintaining adult forms of molluscs and protochordates in order to obtain gametes for laboratory studies of animal development. The methods also include those for culturing embryonic larvae forms in vitro. (Author/SA)

Describes a constant-temperature observation chamber and includes instructions on constructing the apparatus. Suggestions for use are given as well as problems that might be encountered. (Author/SA)

Recommendations are given for obtaining high quality preparations of chromosomes with relatively little equipment using an improved Feulgen-squash technique. (Authors/SA)

Presents a method for microscopically examining cytoplasmic streaming in root cells, and physiologically examining the delivery of ions to the xylem exudate. The expected result does not occur and the authors believe that students learn to re-examine the assumptions, thereby increasing their skills in scientific inquiry. (Authors/SA)

Discusses various aspects of in-service training and the design of self-instruction material. Special reference is given to materials for application in various places but developed at a central location. Results are given of the use of experimental materials in medical laboratories in The Gambia. (Author/SA)