Vertigo. Megrims. Blind Staggers. 79 



pouches, adjacent glands, petrous temporal bone, niembrana 

 t^'nipani, external ear). Indurated wax, insects or insect larvae 

 may be removed by careful irrigation with warm water, and per- 

 haps by chloroform. Nasal parasites must be washed out or de- 

 stroyed by benzine, and any hyperaesthesia of the nasal mucosa 

 may be met by covering the nostril with a net, or radically by 

 cutting the facial branch of the 5th nerve as it emerges from the 

 infra-orbital foramen. 



When attacked the horse should be at once stopped and put 

 under the shadow of a roof or tree, or in their absence a blanket 

 or lap robe may be used to cover his eyes. If there is danger of 

 falling remove the harness, and secure a soft piece of ground, 

 free from stones or other hard bodies. Cold water applied to the 

 head will sometimes check. A common practice is to bleed from 

 the palate, and in plethoric cases especially, and in such as are 

 dependent on congestion, tumors or other lesion of the brain it is 

 to be commended. The action will be rendered more pronipt and 

 effective if the blood is taken from the jugular. A laxative diet, 

 and carefully regulated work are desirable to obviate the tendency 

 to the affection, and this may often be accomplished by a run at 

 pasture. Otherwise daily small doses of Glauber salts in the feed 

 may suffice. Bromides may be used to calm nervous excitement. 



In cases of gastric vertigo an active cathartic, followed by 

 smaller laxative doses or a laxative diet and a course of bitters 

 may prove useful. Such cases should never be worked on a full 

 stomach but should be left at rest for at least an hour after a meal. 



In aural vertigo special attention must be given to the throat, 

 and external ear. Bromides maj^ often be useful, and sometimes 

 benefit may be derived from an occasional blister or light firing 

 back of the ear. 



In ccenurus cerebralis in sheep the only resort is to trephine 

 and remove the parasite. 



