DISEASES OF THE RESPIRATORY ORGANS. 105 



opening seen in the middle of the tongue, pushed to the lower 

 end of the windpipe, turned round several times and withdrawn, 

 when a few worms will be found attached. It may be repeated 

 at intervals, and is still more effectual if the instrument is first 

 dipped in oil, salt water, or a weak solution of carbolic acid, 

 tobacco, or sulphurous acid. The treatment is only partially 

 successful, as it fails to remove worms lodged in the bronchial 

 tubes or air sacs. Cobbold made an incision in the windpipe 

 and extracted the worms with forceps, while Bartlett succeeds 

 with turpentine smeared on the neck and which is of course 



Fig. 16.— %ngaTnus Trachealis. Gape-worm, nat. size, and enlarged. 



inhaled. A removal from the contaminated ground, the supply 

 of pure water (boiled if necessary), and an abundance of nourish- 

 ing diet are essential elements of treatment 



Prevention. — Burn all the worms extracted from the air 

 passages. Keep fowls from ground and houses which are 

 known to be infested, until they have been soaked in a strong 

 solution of salt, or with crude carbolic acid or petroleum. 

 Suspected water must be withheld or boiled. Avoid all green 

 food from an infested locality. The carcasses of the dead must 

 be burned. Young fowls may be raised safely indoors on the 

 worst infested farms. 



