Meningo — Encephalitis. Staggers. 95 



C. Purulent Meningitis. 



D. Serous Meningitis. 



E. Tubercular Meningitis. 



F. Traumatic Meningitis , etc.^ 



G. Cet ebro-Spinal or Infective Meningitis. 

 H. Acute Meningitis. 



I. Chronic Meningitis. 



J. Polioencephalitis Corticalis. Inflammation of the brain cortex. 



K. Polioencephalitis Superior. Inflammation of convolutions 

 around the Sylvian fissure, palsy of the eyeball. 



L . Polioencephalitis Superior. Inflammation of the Medulla, 

 "bulbar palsy. 



M. Interstitial Inflammation of the Brain. Resiilting often in 

 sclerosis. 



In the lower animals, however, where we cannot avail of sub- 

 jective symptoms, such fine distinctions can rarely be made in 

 diagnosis and except in case of an uncomplicated meningitis, or 

 a circumscribed encephalitis, which affects only a limited group 

 of muscles like those of the eye, arm, or leg, we have to fall 

 back upon a more general diagnosis. Again meningo-encepha- 

 litis is more common than the uncomplicated affection of the 

 brain, or the membranes, and therefore, we shall follow Trasbot 

 in dealing with the combined affection, and noting incidentally 

 the distinctions that can be made in the more purely limited 

 affections. 



Causes. Mechanical Injuries. Pachymeningitis occasion- 

 ally results from blows or other injuries upon the head, especially 

 in stallions and vicious horses struck with a heavy whip or club, 

 cattle and sheep injured in fighting, and oxen hurt by the yoke. 

 These injuries may also affect the brain as in concussion, or by 

 the extension of the disease into the nervous tissue. In the 

 cranium of a stallion in the New York State Veterinary College 

 Museum the whole of the meninges are greatly thickened by a 

 traumatic meningitis of old date and the subjacent cerebral con- 

 volutions of the right hemisphere are deeply encroached on, flat- 

 tened and absorbed over an area of 1% inches in the longest 

 ■diameter. 



Diet. Among the most common causes of encephalitis in 

 iorses is an injudicious dietary. Overfeeding with grain, but 



