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Part I

Introduction. Investigations regarding onchocerciasis were begun by the writer and other members of the staff of the Department of Tropical Medicine of Harvard University in 1926–27, in Africa. A report of these studies was published in 1930, in Chapters XVII and XVIII of "The African Republic of Liberia and the Belgian Congo."¹

In 1931 and 1932 further studies regarding onchocerciasis were carried out by this Department in Guatemala, and these were published in 1934 in a monograph entitled "Onchocerciasis with Special Reference to the Central American Form of the Disease."² In Central America the lesions of the disease often resulted in disturbances of vision and blindness, and the affection there in earlier years was frequently referred to as the blinding filarial disease, and the parasite which caused it as Onchocerca caecutiens.

During the latter part of 1934, investigations were continued in Africa, particularly in the Provinces of Lusambo (formerly Kasai), and Elisabethville, (formerly Katanga), of the Belgian Congo, and in Northern Rhodesia.

¹ Harvard University Press, Cambridge, Massachusetts, 1930.

² Harvard University Press, Cambridge, Massachusetts, 1934.