Th? main object of this paper is to put before the readers: (1) the various points of interest with regard to the life-history, pathogenicity of filaria bancrofti, and the etiology of elephantiasis, lymphangitis, etc., (2) the several problems, so far solved, and those yet to be solved, in connection with the above, (3) to discuss certain features that are peculiar to filarial diseases, and als...