DISEASES OF NERVES 261 



to the recurrent nerve, where it turns from left to right 

 hehind the arch of the aorta. That this is by no means the 

 only cause of this important condition— roaring— the classical 

 investigations of Prof. Thomassen, Utrecht, now conducted, 

 by him, tend to show. 



What are the symptoms of nev/ritis ? 



Injury of the nerve fibrils may lead to sensory or motor 

 disturbances. Depending on the severity of the lesion, the 

 symptoms are either those of irritation or destruction— that 

 is, neuralgia or anesthesia, spasm or paralysis.. 



Outline the treatm,ent of neuritis ? 



Anodynes, counter-irritants, and, as a final, neurectomy. 



To what extent does the combined injection of cocaine and- 

 morphine influence neuritis f 

 During the past five years I have had several cases of; 

 chronic lameness in which I was unable to find pathological 

 lesions sufficiently severe to satisfy me as to the cause of the 

 intermittent supporting-leg lameness which the horses exhib- 

 ited. Two were lame behind and had been treated for several 

 months with liniments and blisters by other gentlemen. The 

 first one had injected a cocaine-morphine mixture over th& 

 posterior tibial nerve. The owner not having any use for him, 

 rested him for two days, reporting the animal perfectly free 

 from lameness a few days later. The second one was injected! 

 twice a week for two weeks and has remained free from lame- 

 ness since. The other cases were lame in front, showing a 

 moderate low lameness. In order to settle this question, I 

 injected them over the high plantar neurectomy site. In all 

 of them lameness was much less after the first injection on 

 the following day than previously. These injections wer& 

 repeated three to four times before the lameness finally disap- 



