Hughlings Jackson urged repeatedly that the experiments of nature on man should be described, although their interpretation must often remain incomplete for the time. In the following unusual case the condition may be evaluated in terms of postencephalitis, myoclonus or reflex epilepsy. The patient's definite responses to exposure of the eyes to bright light were so constant that the history and observations are recorded, although many important questions must be left unanswered for the present.
REPORT OF A CASE
History.
—A farmer's daughter, aged 24, unmarried, had been admitted to the Springfield State Hospital, Sykesville, Md., on June 4, 1929, at the age of 19 years, because of epileptiform convulsions, inability to withstand bright sunlight and increasing mental deterioration. Her first convulsion occurred at the age of 7 years. At the age of 13 she had two more, during the summer of 1923. Having progressed in school regularly thus far