Disease detectives are still at work on the mysterious epidemic that killed 27 people and felled 128 others at the American Legion's Philadelphia convention in late July (TIME cover, Aug. 16). They have largely excluded all the seemingly probable causes (mostly microbes), and are moving on to an apparently almost limitless number of esoteric possibilities. Last week, as expert laboratory scientists and technicians in Philadelphia and at the Center for Disease Control in Atlanta concentrated on chemical toxins as suspects, no one could yet offer a plausible let alone provable explanation.
Toxicologists have...