Discusses the generation, collection, and disposal of hazardous and other wastes in the chemistry laboratory. Offers suggestions related to these three areas to provide a safe teaching environment, including minimizing amounts of reagents used (and potentially wasted) by scaling down experiments. (JN)

Lists 37 chemicals classified as suspected carcinogens and suspected teratogens (chemicals capable of producing malformations in an embryo). Offers suggestions to high school chemistry teachers for conducting safe laboratory investigations by avoiding use of these potentially toxic materials. (Author/JN)

Reviews the dangers of benzene as a toxin as well as a flammable substance. (CS)

Chromatographic techniques are used in conjunction with a Parr oxygen combustion bomb to determine sulfur in fuel oils. Experimental procedures and results are discussed including an emphasis on safety considerations. (SK)

Describes the methods and materials needed to make stage and ocular micrometers. These can be used in secondary school and college level biology classrooms. (MA)

Suggests that cyclohexane be used as a solvent in experiments usually using benzene, which has been placed on the list of chemicals that are confirmed carcinogens. Reasons for selection of cyclohexane and experimental procedures using this solvent are described. (CS)

A procedure is described for providing preparations of dividing cells from root apical meristems, requiring only inexpensive equipment and minimal experimental skill, and using 8-Hydroxyquinoline and Toluidene-blue as a chromosome stain. The method has been sucessfully tested in schools and yields permanent preparations of adequate quality for…

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)

Answering critics of language laboratory effectiveness, this article presents a methodology for laboratory work which includes working in partnership. Necessary technical equipment is described. Learning goals are proposed, and possible further developments in the method are suggested. (IFS/WGA)

A description of the commercially produced Harris Data Memory is presented. Operation instructions, memory capabilities, data storage, and applications are included. Usefulness of the instrument to instruction in all of the sciences is considered. (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)

Techniques for digitalizing analog signal data are presented and compared. The techniques presented are: boxcar averaging, ensemble averaging, unweighted digital filter, weighted digital filter, and analog filter. (BB)