Henpuye, or dog nose, is a disease frequently met with in the Gold Coast Colony and in certain portions of its Hinterland. The hideous deformity of the face which it causes is very striking to anyone who has lived in this part of West Africa. It is also known on the French Ivory Coast under the name of “goundu” or “anakhre,” but “henpuye” is the native name (Appolonian) for the disease on the Gold Coast. The peculiar nature of the disease and the fact that, as far as I could find, very little was known as to its nature led me to make the inquiries which are now embodied in this report. I regret very much that I am unable to refer to original papers on the subject or to be certain that I have the full literature, but my excuse is that libraries do not exist in West Africa. The only references which I have met with are those mentioned in Dr. Patrick Manson’s work on “Tropical Diseases” (p. 594), and they are those of (1) Professor Alexander Macalister (Royal Irish Academy, 1882), (2) Surgeon J. J. Lamprey, A. M. S. (_Brit. Med. Jour._, vol. ii., 1887), (3) Dr. Henry Strachan (_Brit. Med. Jour._, vol. i., 1894), and (4) Dr. Maclaud (Archives de Médecine Navale, 1895). It is by the kind permission of the Governor of this colony, Sir Frederick Hodgson, K. C. M. G., that I am allowed to publish this report. I am much indebted to Captain Armitage for his kindness in giving me information with regard to the different places in which he has noticed this disease in his travels, for drawing my attention to notes of the late Mr. Ferguson on the presence of the disease in Akim and Kwahu, and for making a painting of an advanced case of the disease; also to Dr. Henderson, the chief medical officer of the colony for many kind suggestions: and, lastly, to Mr. Crowther, draughtsman in the Public Works Department, for supplying me with a map of the colony and its Hinterland. The description of the disease will be divided into the following headings: (1) the General Description of the Disease; (2) the Description of Cases of the Disease; (3) the Treatment; (4) the Morbid Anatomy; (5) the Ætiology; and (6) the Geographical Distribution. THE GENERAL DESCRIPTION OF THE DISEASE.