94 



Scientific Proceedings (57). 



52 (869) 



A consideration of certain foods and of proximity to a previous 

 case as factors in the etiology of pellagra. 



By J. F. Siler, M.D., P. E. Garrison, M.D., 



W. J. MacNeal, M.D. 



[From the Thompson- McFadden Pellagra Commission of the New 

 York Post-Graduate Medical School.] 



A statistical study of the foods used and of the occurrence of 

 pellagra in six mill villages, including about 5,000 persons, failed 

 to reveal any consistent relationship between the use of any 

 particular food and the occurrence of pellagra. A somewhat 

 similar statistical study of the location of domicile of old cases of 

 pellagra in relation to domicile of the remaining population in 

 these same mill villages has shown that new cases of pellagra 

 developed almost exclusively in persons living in the same house 

 with such antecedent cases or in houses next door to them. In 

 other words, the disease spread from a preceding or antecedent 

 case as a center, a phenomenon which can be satisfactorily ex- 

 plained, in our opinion, only by assuming that pellagra is an infec- 

 tious disease. Apparently it is not readily transmitted to any 

 considerable distance. 



53 (870) 



The relation of methods of disposal of sewage to the spread of 



pellagra. 



By J. F. Siler, M.D., P. E. Garrison, M.D., 

 W. J. MacNeal, M.D. 



[From the Thompson-McFadden Pellagra Commission of the New 

 York Post-Graduate Medical School and Hospital.] 



As we have observed in it our field studies, pellagra has spread 

 most readily in communities in which unscreened surface privies 

 were in use. In those portions of the city of Spartanburg, South 



