Annual report of the Board of Regents of the Smithsonian Institution . s, like the preceding, conveyedby Culex and Anopheles^ in which it accom-plished an evolution comparable to that of theFilaria hancrofti^ except that the embryoes weretransformed into larvse not in the thoracicmuscles but in the malpighian tubes. The same course is pursued by the followingspecies: Filaria recondita^ which lives in thefatty perirenal tissue of the dog, and is propa-gated by fleas and also, it is true, by a tick, Rhi-picephalus siculus; Filaria perstans of the con-nective tissue of the base of the mesentery o
Annual report of the Board of Regents of the Smithsonian Institution . s, like the preceding, conveyedby Culex and Anopheles^ in which it accom-plished an evolution comparable to that of theFilaria hancrofti^ except that the embryoes weretransformed into larvse not in the thoracicmuscles but in the malpighian tubes. The same course is pursued by the followingspecies: Filaria recondita^ which lives in thefatty perirenal tissue of the dog, and is propa-gated by fleas and also, it is true, by a tick, Rhi-picephalus siculus; Filaria perstans of the con-nective tissue of the base of the mesentery of man,which is common in Guiana and West Africa, andwhich, according to Feldmann, may be transmitted also by a tickwhich has been described but not named; Filaria lahiato-papillosaof the peritoneum and eye of cattle, which is inoculated by fliesclosely allied to the common fly, the Sto7nox; Filaria medinensis,which lodges in the subcutaneous connective tissue of man, the horse,ox, and dog, and which is not conveyed by an insect, but by smallcrustaceans, the Fig. 4.—Embryos ofFilaria immitis of theblood of the dog X300. After Railliet. C. YELLOW FEVER. Yellow fever is a disease of man which belongs to the category ofmaladies called diseases due to invisible, or ultra-microscopic, mi-crobes, because the latter are so small and attenuated that oftenthey can not be discerned by the aid of the most powerful most extraordinary suppositions have been made regarding theorigin of this terrible disease. The celebrated experiments made in AKTHROPODS TO PATHOLOGY MAROTEL. 709 1901 by the American commission in Cuba have shown that it isexclusively clue to the bite of a mosquito, Stegomyia calojnis. Infact, by forty different repetitions this commission was able to re-produce yellow fever experimentally by causing healthy individualsto be bitten by infected Stegomyia. In addition these results, whichconstitute a striking confirmation of the mosquito th
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