Doctor with Two Heads

This collection includes the circuitous tale of how Weissmann's consideration of epidemics in relation to French political unrest led to his discovery of Lyme disease. In his ``self-consciously erudite essays . . . Weissmann leaps from dung beetles to Swift's Gulliver's Travels , from military metaphors for tissue inflammation to Casablanca ,'' said PW. Illustrated. (May)