Abstract
Geographic conditions and climate have long been recognized as exercising an important influence on the regional occurrence and transmission of diseases. Thus, it has become customary to refer to them under such classifications as tropical or subtropical disorders, in contrast with the maladies of the temperate and colder zones. In recent years the increasing ease of travel resulting in the actual migration of large numbers of persons, on the one hand, and the mingling of the members of many nations and races, on the other, in the armies and on the battlefields of Europe, have brought unanticipated changes in the incidence of many diseases in which an infectious agent is involved. At various times the unexpectedly wide recent distribution of intestinal parasites formerly associated with circumscribed areas of the globe has been referred to inThe Journal.<sup>1</sup>One might almost assume that all the ancient barriers had been broken
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