6o THE FARM DOCTOR. 



diarrhoea, or even blood-poisoning and sudden death. It 

 seems not improbable that the attacks of this worm in the 

 liver may produce a disorder which is confounded with Ho^ 

 Cholera. Its presence in the kidney may sometimes be recog- 

 nised by the existence of microscopic eggs in the urine. The 

 same results from another worm — Eustrongyhis Gigas. But 

 without the observation of such eggs weakness of the hind 

 parts cannot be ascribed to the kidney -wortn. 



Treatment is unsatisfactory. Small doses of salt and oil of 

 turpentine may be given with no great hope of success. The 

 favourite dose of arsenic only escapes killing the hog because 

 he rejects it all by vomiting. If beneficial at all it must be in 

 small doses, one-eighth to one-sixth grain, so that it may be 

 taken up into the system. 



Prevention is to be sought by keeping the healthy and 

 diseased apart, and especially by raising young pigs apart 

 from the ground occupied by the old. 



TRICHINA SPIRALIS. 



This worm, which is capable of being reared in all the 

 domestic animals, is especially common in man, the hog, and 



Fig. 9,— Adult Intestinal Trichina Spiralis, magnified. 



the rat. Trichinae are almost microscopic, varying from one- 

 eighteenth to one-sixth inch in length, yet they are among the 

 most deadly worms known. The mature and fertile worm 

 lives in the intestines of animals, the immature in minute cysts 



