Potassium accumulation frog muscle: the association-induction hypothesis versus the membrane theory.

Zone (4); Santa Barbara Basin, California (5); Lake Biwa, Japan (6); Lake Washington, Washington (7); and the Amazon River (8). It is thought that perylene in these sediments results from the diagenesis of terrestrial pigments which have been rapidly deposited into a reducing sediment. This idea also seems to account for the presence of perylene in this sewage lagoon. We feel it is important not to perpetuate Rose and Harshbarger's suggestion that perylene in this lagoon results from the activity ofjet aircraft when a natural source seems more likely. JOHN G. WINDSOR, JR. ROBERT E. LAFLAMME RONALD A. HITES Department ofChemical Engineering, Massachusetts Institute of Technology, Cambridge 02139