The hygiene of transmissible diseases; their causation, modes of dissemination, and methods of prevention . human body and is associated withchyluria, hematochyluria, and elephantiasis. The life history of this parasite, for much of our knowledgeof which we are indebted to the studies of Patrick Manson,of Brisbane, is, like the filaria medinensis and other filariae,not completed in a single host. The embryonic filarise probably gain access to the bodythrough the drinking of stagnant or polluted water in whichthey have been deposited by the mosquito, now regarded asthe intermediate host. Upon e
The hygiene of transmissible diseases; their causation, modes of dissemination, and methods of prevention . human body and is associated withchyluria, hematochyluria, and elephantiasis. The life history of this parasite, for much of our knowledgeof which we are indebted to the studies of Patrick Manson,of Brisbane, is, like the filaria medinensis and other filariae,not completed in a single host. The embryonic filarise probably gain access to the bodythrough the drinking of stagnant or polluted water in whichthey have been deposited by the mosquito, now regarded asthe intermediate host. Upon entry into the alimentary canal the young filariaebore through the mucous membrane and take up their abodein the deeper lymphatics. When mature, the female worm,which is, according to Manson, about 3 inches long andabout YTo irich in thickness, is seen to be packed with em-bryos in all stages of development. These wander from theparent into the circulating blood and appear as tiny, activelymoving, almost homogeneous worms that are readily detectedby their lashing movement when a drop of blood containing. Fir;. 26.—Filaria sanguinis hominis nocturna. Magnified about 200 diameters,showing relative size to the corpuscles of the blood them is examined under the microscope (see Fig. 26). Theyare about 37--^,^ inch in diameter and from -^-^ to -^ inch inlength. At this point their development in man , and See illustrated paper by Henry : Trans. Assoc, .liii. Phys., 1896, vol. xi.,page 96. DISEASES DUE TO ANIMAL PARASITES. 229 can only progress further by the intervention of another ani-mal that serves as an intermediate host. This, Manson be-lieves, is the mosquito, which in sucking the blood from aninfected person takes up the embryo filarise, to deposit themsubsequently in water, from which the cycle here outlinedmay be repeated. One of the most interesting features ofthis nematode is the periodicity of its excursions from theparent, or from the deeper lymphatics into the m
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