The findings from the research highlight a number of key issues which have already been outlined in my previous reports, however, these are repeated in summary as follows; * First, the results have confirmed the results of previous local and international studies which indicated that endosulfan I is the more volatile isomer. However, the study has shown that both isomers readily volatilise from a free water surface. * Secondly, the principal isomer of endosulfan (endosulfan I), can be rapidly degraded by naturally occurring soil microorganisms from tailwater drain sediments when these organisms are encouraged to grow in anaerobic growth media in laboratory liquid cultures. This finding indicates the potential of microorganisms to degrade endosulfan in environments where oxygen is limiting. *Thirdly, endosulfan is dissipated at a slow rate from both sullage pit soils and soils from a cotton growing field under aerated conditions in the laboratory. This occurs regardless of whether the soil is sterilised or biologically active. It is likely that the absence of readily available forms of carbon in these soils limited the degradation rates.