DURINVG the past 2 years the Epidemiological Intelligence Services of the \West have repeatedlv requested cooperation in the solution of the etiologic factors responsible for outbreaks or sporadic cases of jaundice. Epidemics involving small rural schools have occurred in AMay and June and affected as many as 42 children at one time. In another, the cases of catarrhal jaundice were seen in familial distribution shortly before or during the rainy season which was followed by floods. Invariably, the serological examination, inoculations of guinea pigs, and the examination of rodents collected within the epidemic area yielded no evidence which would stigmatize the Leptospira icterohaemnorrhagiae as the cauisative factor. In fact, a careful analysis of the clinical cases, the incubation time of from 3 to 4 weeks, and the obvious contagious character lead to the conclusion that these outbreaks were indistinguishable from the well known epidemic catarrhal or infective hepatic jaundice previously described by Blumer1 and others for this country and well known in Great Britain through the publications by Pickles,2