196 



THE FARM DOCTOR. 



Other affections of the iav^^, fatty degeneration, tubercle, 

 mncer, hypertrophy, atrophy, are manifested by the general 

 symptoms of hepatic disorders, but space forbids further notice 

 of them here. 



FARASITIC DISEASES OF THE LIVER. 

 LIVER-ROT. FLUKE DISEASE, 



This affection is most destructive to sheep, of which it has 

 destroyed as many as n-om one to two million head in England 

 alone in certain years. It is immediately determined by the 

 presence in the gall ducts of two flat leaf-like parasites — the 

 t'asciola Hepatica and the Distomum Lanceolatum — the first | 

 to I inch in length, tlie second 4 lines. These inhabit the 



ti^ 37. — Fasciola Hcpntica. Fig. 38. — Distomum Lanceolatum. 



^'all ducts of all the domestic animals, of many wild animals, 

 and even of man, but in most ot these they do little harm. 

 The eggs of these parasites laid in the gall ducts cannot be 

 developed there, but pass out with the bile and dung, hatch in 

 iioois of fresh water in which the embryo floats until it finds a 

 bollusk, in which it encysts itself and l^ecomes a brood capsule. 



