288 The Farmer's Veterinary Adviser. 



PABASITia DISEASES OF THE LIVER. 

 UVEE-BOT. FLUKE DISEASE. 



This affection is most destructive to slieep, of which i( 

 has destroyed as many as from one to two million head 

 in England alone in certain years. It is immediatelj' 

 determined by the presence in the gall ducts of two flat 

 leaf-lite parasites — the Fasciola Hepatica and the Disto- 

 mum Lanceolatum — the first | to 1 inch in length, the 



Kg. 37. Fig. 38. 



Fig. 37 — Fasciola Hepatica. Fig. 38 — Distomum Lanceolatuiu. 



Becond 4 lines. These inhabit the gall ducts of all the 

 domestic animals, of many wild animals and even of man, 

 but in most of these they do Httle harm. The eggs ol 

 these parasites laid in the gall ducts cannot be developed 

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

 of fresh water in which the embryo floats until it finds 

 a moUusk, in which it encysts itself and becomes a brood 

 capsule developing many new embryos within it; theso 

 embryos may form new brood capsules and thus increase 

 their numbers materially, or if swallowed by a mamma] 

 along with its food or water they develop into the mature 



