_G._ _Cerebro-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 Inferior._ Inflammation of the Medulla, bulbar palsy. _M._ _Interstitial Inflammation of the Brain._ Resulting often in sclerosis. In the lower animals, however, where we cannot avail of subjective 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-encephalitis 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 occasionally 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 convolutions of the right hemisphere are deeply encroached on, flattened and absorbed over an area of 1¾ inches in the longest diameter.