DISEASES OF THE KESPIRATOEY ORGANS. 369 



Teeatmext. — A permanent cnre cannot be made if the disease 

 has been running any length of time. The case may be benefited 

 by treatment, and the symptoms removed by judicious treatment 

 and proper food. I have kept a number of horses affected with 

 this disease going through the driving season, without recurrence 

 of the symptoms, by giving an occasional purgative, and feeding 

 on small and regular quantities of wet bran and oats, to which 

 was added three ounces of linseed oil and three ounces of lime 

 water. This was mixed with each feed for several weeks at a 

 time. The water was given in measured quantities, in order that 

 the stomach should not be overloaded. Internally was given 

 calomel, camphor, opium pulverized, digitalis, of each a half 

 drachm, made into a bolus and given twice a day for a week at a 

 time; and then arsenious acid, grains two; sulphate of iron, two 

 drachms, were substituted. Drachm doses of nux vomica were 

 also given. 



Low horse dealers frequently administer lead pellets, large 

 doses of oil, which, acting mechanically, will relieve the symp- 

 toms for the time being. A strong purgative of any sort will 

 relieve the symptoms, as will the reduction of food for a few days. 



LARYNGISMUS PARALYTICA. 



This condition gives rise to roaring, which may be defined as 

 breathing with a loud and unnatural sound. It is due to paralysis 

 or atrophy of the dilator muscles of the neck. The muscles in- 

 volved are the crico-arytenoideus, posticus and lateralis, the 

 arytenoideus and the thyro-arytenoideus. 



The muscles are atrophied, or paralyzed, from various diseases 

 which affect the larynx. The loosely flapping parts of the larynx 

 no doubt produce the roai'ing sound. It is an unsoundness in all 

 its stages. To detect a roarer, he must be put to a severe test; 

 have the animal galloped for some distance by an assistant, who 

 may pull him up suddenly in front of you, when wheezing, 

 whistling, or roaring may be heard by placing the ear to the 

 trachea. If he is a roarer he may be heard at a great distance. 

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