The author has published an extended account of his studies on the larvae of Strongyloides stercoralis discovered in the pericardial fluid and the pleural exudate of a native of Bahia, Brazil. He discusses in successive sections the classification, life cycle, means of infection, and pathologic results of the invasion of the parasite. An important item is his list of the occurrence of such larvae in unusual locations in the body of the host. While the author has been able to contribute little that is new, the account is unusually complete and accurate. It will serve as a most valuable summary of knowledge for all workers desiring such an account in the Portuguese language.