DISEASES DUE TO ANIMAL PARASITES 197 



in its life-history. It is a disease of tropical climates. 

 The embryos may be found in considerable numbers in 

 the blood at night in day workers, or during the day in 

 those who work during the night. The embryos occur 

 in such numbers at times as to block the lymph-channels, 

 producing the conditions known as hematochyluria, ele- 

 phantiasis, and lymphy scrotum. 



Morbid Anatomy. Opportunities for examining these 

 cases postmortem are rare. In a case examined, the 

 renal and peritoneal lymph-plexuses were enormously 

 distended. 



Morbid Physiology. Chyle and blood are passed 

 with the urine, and the scrotum becomes infiltrated 

 with lymph, which flows freely if the skin be punctured. 



