Designed for high school science teachers, the document warns of potential health threats of performing certain experiments and using certain chemicals or chemical combinations in their courses. Following a rationale for more carefully considering health dangers, the document gives suggestions on what can be done by teachers. Reports such as a survey by the Kentucky Labor Department, in which officials found that 90 percent of the state's four-year colleges and 5 percent of the high schools had one or more cancer-causing chemicals, are cited as sources of increasing concern. Sixteen carcinogens regulated by the Occupational Safety and Health Administration (OSHA) are listed, followed by a chart listing dangerous combinations of common school chemicals. Other cautions on handling chemicals are described and organic chemistry is discouraged at the high school level. Teachers are encouraged to re-evaluate laboratory equipment and chemicals and schools are urged to develop safe procedures for storage, use, disposal, and supervision by qualified personnel. (LH)