Catarrhal jaundice, or acute duodenitis with icterus, is a common disease in children between the ages of 3 and 6 years. It is, however, only infrequently met in children under 2 years of age, and is extremely rare during the first year of life. Holt,1 for example, states that he has never seen a case in a child under 2 years of age. Henoch,2 the "father of pediatrics," saw only two cases in children under 1 year in all his wide experience, one of these being 8 weeks, the other 5 months old. Flesch,3 writing from Bókay's clinic, classes catarrhal jaundice in infants under 1 year as among the greatest rarities, and in looking over the records of Bókay's "Stefanie Children's Hospital" for a period of ten years, found only one typical case (a baby 1 month old) among 160,000 admissions. Starck4 reports 65 cases of