In 1859 a Hungarian obstetrician named Ignaz Semmelweis, reflecting on his years as resident in the Vienna maternity clinic, wrote a graphic account of his attempt to diagnose and eliminate the then epidemic scourge of childbed fever. The resulting Etiology triggered an immediate and international squall of protest from Semmelweis's colleagues; today it is recognized as a pioneering classic of medical history. Now, for the first time in many years,...