212 



COMMON DISEASES. 



tubes. Some lobules of the lungs may show very marked pneu- 

 monia. There may also be tubercles resembling those of tubercu- 

 losis, near the surface of the lungs, and also throughout the lung 

 substance. 



Treatment. — For the present we must consider this as gen- 

 erally unsatisfactory. Treatment by injection of medicines di- 

 rectly into the trachea has been tried and recommended in some 

 cases, but is very apt to prove unsatisfactory. In cases of 

 valuable sheep the following is worth trial : 



Olive oil, ioo grams. 



Turpentine, ioo grams. 



Carbolic acid, 2 grams. 



Give ten grams per day for three days. Each dose is given 

 by a large hypodermic syringe and injected directly through the 

 side, into the trachea. 



FIG. 76. SHEEP GAD FLY (Oestrus ovis). 

 Commonly called "grub." a, Adult; b, Larva; c, Puparium'. 



Prevention. — Change pastures often; keep sheep upon forage 

 crops and upon frequently changed pastures. Avoid ponds and 

 well water which receives drainage from pastures, feed lots or 

 barn yards. 



NASAL GRUB (GRUB IN THE HEAD). 



This is a very poor name for a disease, but is the only one 

 commonly understood and is used here for that reason. 



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