About ten years ago I reported a strange case of myasthenia before the Philadelphia Neurological Society. As this report has never been published and as it is germane to my present subject, I shall reiterate the chief features of the case before speaking of the others that have come under my observation.
—The patient was a physician, aged 35, a native of Pennsylvania, engaged in an arduous country practice in the western part of the state. His family history and his personal history were good. For the last fifteen years he had used tobacco moderately and alcohol occasionally. He had had gonorrhea but never syphilis. About Christmas time he had a mild attack of influenza, for which he stayed in bed less than two days. On the day he resumed work he was drenched by a rain and caught a cold, which was, however, not severe enough to