Abstract
The investigations here published were rendered possible by an invitation to undertake the study of this phase of pellagra extended to the author by the Thompson-McFadden Pellagra Commission. Permission to accept this invitation was readily granted by the Illinois State Board of Administration, to whom my respectful thanks are due. Most valuable assistance was rendered by the physicians of Spartanburg County, by Dr. J. W. Babcock, superintendent, and the medical staff of the South Carolina State Hospital, to one of whom, Dr. E. B. Saunders, I am especially indebted for information and assistance, and finally by the medical officers of the Georgia State Sanitarium. Dr. E. M. Green, clinical director, and Dr. J. W. Mobley, first assistant physician, especially gave of their time and wide experience with ungrudging courtesy. The whole medical staff vied with one another in assisting with the patients and records and contributed materially to

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