Meningo — Encephalitis. Staggers. 95 



C. Purulent Meningitis. 



D. Serous Meningitis. 



E. Tubercular Meyiingitis. 



F. Trazimatic Meningitis, etc. 



G. Ce7'ebr-o- Spinal or Infective Meningitis. 

 H. Acute Meningitis. 



I. Chronic Meningitis. 



J. Polioencephalitis Corticalis. Inflammation of thejjrain cortex. 



K. Polioencephalitis Superior. Inflammation of convolutions 

 around the Sylvian fissure, palsy of the eyeball. 



L. Polioencephalitis Inferior. Inflammation of the Medulla, 

 bulbar palsy. 



M. Interstitial Inflammation of the Brai7i. Resulting 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 luicomplicated 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- 

 alb' 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 b\' 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 greath' thickened bj' a 

 traumatic meningitis of old date and the subjacent cerebral con- 

 volutions of the right hemisphere are deepb' encroached on, flat- 

 tened and absorbed over an area of i ^ inches in the longest 

 diameter. 



Diet. Among the most common causes of encephalitis in 

 horses is an injudicious dietary. Overfeeding with grain, but 



