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710 was blocked, and the blood could be stocked with microfilariæ carried by the lymph from only a relatively small lymphatic area; and that there was, therefore, a proportionately lesser likelihood of the presence of parent filariæ having for their young an unobstructed passage to the blood.

Enumeration of the filarial diseases.— The diseases known to be produced by Filaria bancrofti are abscess; lymphangitis; arthritis; synovitis; abscess of hip-joint; varicose groin glands; varicose axillary glands; lymph scrotum: cutaneous and deep lymphatic varix; orchitis; funiculitis; chyluria; elephantiasis of the leg, scrotum, vulva, arm, mamma, and elsewhere; chylous dropsy of the tunica vaginalis; chylous ascites; chylous diarrhœa, and probably other forms of disease depending on obstruction or varicosity of the lymphatics, or on death of the parent filariæ, including peritonitis and secondary infection by pyogenic microorganisms (Wise and Minett).

Abscess.— Occasionally, as already mentioned, whether in consequence of blows or other injuries, of lymphangitis, or of unknown causes, the parent filarise die. Generally the dead body is absorbed, just as a piece of aseptic catgut would be, or becomes cretified.* Sometimes the dead worm acts as an irritant and causes abscess, in the contents of which fragments of the filaria may be found. Such abscesses, occurring in the limbs or scrotum, will discharge in due course, or may be opened; if properly treated surgically they may lead to no further trouble. Should they form in the thorax or abdomen, serious consequences and even death may ensue. Probably, in certain instances, abscess forms at times independently of the death of the parasite; e.g. in varicose glands, in lymph scrotum, in elephantiasis.