As the number of cases of amyotonia congenita reported now totals but some seventy cases, about one-quarter of which are accompanied by autopsy protocols, one need not apologize for adding to the literature on this rare disease. The case I am about to report came to me from the service of Dr. John Lovett Morse, of the Boston Children's Hospital, early in November, 1912. The child had been admitted, in extremis, three days before, suffering from an intercurrent attack of bronchopneumonia, so that a very thorough physical examination was impossible. The diagnosis of amyotonia was based on the history of the case and on the report of the Outpatients' Department, where the baby had been previously examined. These reports, supplemented by a special history, kindly supplied me by the family physician, Dr. J. Shohan, by the report of Dr. Fairbanks on the nerve reactions and by the autopsy findings, make