V! 



CONTENTS. 



PAGE 



7. Anatomy and Natural History of the Liver-Fluke : — 



General remarks on parasites which undergo transformations. 



The Distoma Hepaticum : Origin of the name — Natural size of 

 the liver-fluke — Its colour ; external appearance ; muscular 

 system ; aquiferous system ; ventral sucker ; digestive 

 organs ; and oral sucker. Illustrated. 



Generative organs of the Fluke : The vitelligenes, germ stock, 

 uterus, and oviduct of the female organs — The testes, vasa- 

 deferentia, receptacle, and generative appendage of the male 

 organs. Illustrated. Supposed physiology of the different 

 organs. 



The Natural History of the Fluke : The entozoon parasitic 

 to many creatures— Its ova (illustrated) — Experiments 

 with ova — The period of their life— Duration of the life 

 of the ova of intestinal worms — Embryos of the fluke — 

 Alternation of generation — Dr. Cobbold's description of 

 cercaria3 — Cercaria-sacs — Development of cercariee — En- 

 cysted cercarise the penultimate form of the fluke (illus- 

 trated) — Great liability of ruminants to be affected with 

 flukes — The entozoon widely distributed — Found in the 

 ox, horse, ass, pig, and other animals — Descriptive cases of 

 rot in cattle, supplied by Mr. Lepper, Mr. Thompson, and 

 Mr. Blakeway — Cases and discovery of the entozoon in 

 man — Influence of temperature and moisture over the 

 transformations of the fluke 34-60 



8. Quick Contamination of Sheep : — 



Early mention of these cases — Examples given by Dr. Harrison 

 and Youatt — Case reported by Mr. J. S. Turner — Letter 

 from Mr. W. Umbers relating two cases of the kind occurring 

 in the experience of his late father and a friend — Explana- 

 tion of the instances of quick contamination 60-63 



9. The Period of Greatest Danger : — 



Supposed greater danger in the autumn — Influence of a wet 

 spring — Danger of a wet summer — Occurrence of rot at Mid- 

 summer — Beneficial effects of frosts in removing the cause 

 ofrot .. .. .. .. .. .. .. .. .. .,63-65 



10. Symptoms of the Disease: — 



Differences between sthenic and asthenic diseases — Simon's 

 statements with regard to parasitic maladies — The latent 

 stage of rot— The accumulation of fat by sheep affected with 

 flukes — Observations thereon by Youatt, Bakewell, Harrison, 

 and Ellis — Phenomenon explained by reference to the phy- 

 siology of the liver — Dr. Harley and Professor Sharpey's 

 experiments — The fall in condition of rotten sheep — Appear- 



