My excuse for adding this paper to the already rather voluminous literature on malaria prevention is that it embodies the result of a unique experience, and one which, I feel, should be recorded.
My principal duty in Daressalam was to institute a campaign against malaria, and although my training has been almost entirely along the lines of attack on the anophelines (in Panama), I was under the impression, formed from the perusal of Claus Schilling's article in Ross' "Prevention of Malaria," that the method of Koch, introduced in Daressalam by Ollwig1 in 1901-1903, has been successful in so far as it has at least considerably reduced the incidence of malaria.
The results of my study of the conditions in Daressalam have been embodied in a report to the imperial governor of German East Africa, but I was impelled to the writing of this paper by the appearance of Henson's