Proposes an international research laboratory to investigate environmental factors in human health. By international cooperation unnecessary duplication and waste of resources can be avoided and long-term studies can examine various world-wide environments. (JM)

Describes screening systems for environmental mutagens, characteristics of the ideal screening system, characteristics of currently employed screening systems, correlative information required for decision making, and application of data to human populations. (GS)

It is suggested that a system of relative standards be formulated which would compare utility of substances to their relative risk as carcinogens. This would define a range of use restrictions. Substances intended for specific uses would then be regulated according to these standards. (Author/RE)