THE GLANDERS. 51 



Though contagion is the most common source 

 of this disease, it often prevails in places where 

 no infection has existed : induced by some peculiar 

 unknown change that the blood has undergone. 

 I lately had six horses under my care, where no 

 cause could be assigned for this complaint, except 

 over-exertion and noxious air, arising from a num- 

 ber of horses being in the same stable, and not 

 sufficiently ventilated. 



The symptoms accompanying this disorder are 

 a discharge of thick whitish matter, sometimes 

 from both nostrils, but more often only from one ; 

 and then the kernels under the jaw of that side are 

 generally swelled, and adhere closely to the jaw- 

 bone. As the disease advances, the matter be- 

 comes yellowish, or inclining to a green colour, and 

 sticks to the middle of the passage like paste or 

 glue. When ulceration takes place, the discharge 

 is mostly streaked or tinged with blood, of a dis- 

 agreeable odour, and often not so thick as usual. 

 In severe cases the bones of the nose become 

 affected, and begin to decay ; then the discharge is 

 very offensive, and the disease may be deemed in- 

 curable. It is always attended with a hard swell- 

 ing of the glands or kernels under the jaws. The 

 disease makes its appearance with a slight inflam^ 



E 2 



