DISEASES OF THE JiESPIEATORY ORGANS. 99 



A less satisfactory method is to turn up a furrow in tlie pastur<^ 

 so that the sheep may push their noses into the ground when 

 attacked. 



Treatment — Place in a warm building to tempt the larvae 

 from the sinuses, and introduce snuff, solutions of salt, vinegar, 

 or tobacco, weak solutions of turpentine, etc., into the nose to 

 kill them or cause their expulsion by sneezing. For such as 

 remain in the sinuses the only successful treatment is to tre- 

 phine the bones of the face between the front of the eye and 

 the median line of the face, or just in front of the loot of the 

 horn, should that be present. The sinus is then to be syringed 

 out freely with tepid water until the parasites are washed out. 



The Pantastoma T.^nigides is a species of acarus which 



Fig. 14. — Pentastoma Tsenioides. 



lives in the nasal sinuses of horses and dogs, aiul in the mesen- 

 teric glands of sheep and other herbivcra. If productive of 

 much irritation in the nose it must be expelled by a current of 

 water after trephining the sinus. 



PARASITES IN THE LOWER AIR PASSAGES. 



The most common are the different forms of round worms, 

 which in certain animals (lambs, calves, pigs, birds) may assume 

 the dimensions of a plague, and cause enormous yearly losses to 

 a country. 



The sheep, goaf, dromedary, and camel harbour two round 

 worms in their air passages and lungs : the small Strongylus 

 filaria, a thread-like worm of one to three and one-half inches 



