132 INFECTIOUS AND PARASITIC DISEASES. 



Beyond the fact that the eggs will develop to a certain 

 stage in water, nothing is known of the life-history of 

 this parasite. 



Another liver fluke, common in sheep ; it is 

 Fasciciola also found in cattle, hogs, horses, and 

 Hepatica. ruminants in general. They produce in 



sheep the so-called " liver- rot." The worm 

 is a frequent parasite of animals in the United States. 

 Few cases, however, have been described in human 

 beings anywhere. The symptoms of infestment are 

 the same as in the other liver-fluke diseases already 

 described. The eggs of the parasite are found in the 

 stools. They are taken into the body probably in 

 water or upon raw salads. 



This fluke is distinguished from other 

 ScmsToso- flukes already described by the fact that it 

 MUM H^MA- jg ^^^^^ j^ ^^^ ^^^^^ particularly the por- 



TOBIUM , . 1-11 rr^i 1. 



(B'lha * ^^^^ ^ ^^^ branches. Ine disease 



hfiematobia). which it causes, haemic distomiasis, Bilhar- 

 ziosis, or Egyptian haematuria, is prevalent 

 in Egypt, Africa, Persia, and the west coast of India. 

 It is said to occur in Cuba and Porto Rico also. Im- 

 ported cases are occasionally encountered everywhere. 



In this fluke the sexes are separate. The eggs of 

 the parasite are the chief cause of mischief. 



Symptoms of the disease are practically always 

 referable either to the bladder or rectum. In involve- 

 ment of the former viscus there is pain and burning over 



