30 Roaring in Horses. 



Roarer, and only one Broken-winded. All breeders are 

 agreed that Roaring is not hereditary in this climate." 



For Egypt the evidence is somewhat conflicting. By some 

 observers, Roaring is reported as almost enzootic, no breed 

 of horses enjoying immunity. According to Mr. lleyrick, 

 it is far more prevalent than in England : " In the streets 

 of Cairo, 'Arab or Syrian horses can be heard to Roar 

 while drawing the carriages of the gentry. Shortly after 

 our army reached Cairo at the latter end of 1882, a severe 

 form of Fever, resembling Anthrax in many respects, broke 

 out amongst the horses, many hundreds of them being 

 attacked. Within two or three months after this outbreak 

 subsided, it was found that an extraordinary number of the 

 horses had become Roarers. All except a few had been 

 treated for the Fever, and I am inclined to think that these 

 few had ["also been affected, but in so slight a form as to 

 escape notice. In some cases the only symptoms observ- 

 able were a quickened pulse and breathing, with a yellow 

 tinge of the mucous membranes and loss of appetite. As 

 more than half of the private soldiers, and likewise the 

 veterinary surgeons, were in hospital, those left had so 

 many animals to attend that slight cases of illness might 

 easily have been overlooked. On making post-mortem 

 examinations of some of those which died, I found infiltra- 

 tions of lymph in various parts of the body. Possibly the 

 Roaring may have been caused by the pressure of some of 

 these deposits upon the nerves supplying the larynx. I 

 afterwards found that a similar Fever is present nearly or 

 quite every year in Egypt, and it may perhaps be the cause 

 of the Syrian and Arab horses there so frequently becoming 

 Roarers. The cause of the Fever I believe to be malarious, 

 depending upon the annual overflow of the Nile, and 

 aggravated by the absence of sanitary arrangements 

 throughout the country. After several months, many of 

 the Roarers completely recovered, while others remained in 

 the same condition, or became worse, and had to be cast 



