Presents a physical description of a geothermal power plant, details the chemical and thermal effluents, and evaluates the physical and ecological effects of the plant. (GS)

Discusses incidence of methylmercury poisoning throughout the world with increasing industrial and agricultural use of mercury compounds. Describes recent epidemic in Iraq resulting from use of wheat treated with methylmercurial fungicide. New data are presented on the toxicity of methylmercury and its metabolic fate in the human body. (JR)