On February 12, of this year, I was called to come quickly to see N. M., who the messenger said was speechless. He was a well-developed, strong negro man, 60 years of age, his family history good. He had smallpox about thirty years ago, since which time he has not been sick enough to require the services of a physician. He has never had syphilis, gonorrhea, nor rheumatism. He has lived in the Mississippi Valley eleven years, during which time he has had frequent attacks of "dumb chills." For four days prior to this illness, he had daily paroxysms of fever, which came on about noon. At 11 p. m., February 11, he had a hard chill which lasted for two hours. The fever rose quite high and was attended with vomiting. The patient became delirious, and from 2 a. m. to 9 a. m. he was comatose, his wife