Divisions. Causes: traumas, faulty diet, highly nitrogenous, leguminous seeds, undergoing ripening, cotton seed, gluten meal, forced feeding, buckwheat, ryegrass, lupins, cryptogams, trefoil, equisetum, narcotics, microbian ferments, experiments with spoiled food and epizootics in wet years, high temperature, violent exercise, railroad travel, climatic change, complex causes, embolisms, infections, lead, phosphorus, tumors, parasites. Symptoms: with _meningitis_, fever, hyperæsthesia, active delirium and convulsions predominate: with _encephalitis_, dullness, stupor, somnolence, muscular weakness, anæsthesia, paralysis, coma; usually complex, hyperthermia, periods of benumbing, followed by excitement; drowsy, stupid, semi-closed eyelids, drooping lips, ears, and head, latter resting on manger or wall, walks unsteadily, limbs out of plumb, hangs on halter, won’t back, turns in circle, costive, indigestion, tympanies, rumbling, abnormal (often slow) pulse and breathing, congested optic disc; alternate with trembling, excitement, pawing, rearing, plunging, pushing against the wall, trotting motions, etc.: uncontrollable violence; severity and frequency of paroxysms indicate gravity; recovery: sequelæ. Duration: death in 24 to 36 hours: or weeks. Prognosis: one-quarter recover, with increased susceptibility; nervous animals worst. Lesions: extravasation, congestion, exudates, pus, thickened meninges; choroid plexus: brain matter gray or red, puncta, infiltrated, softened, excess of leucocytes, red softening, yellow softening, sclerosis, cicatrix, abscess. Diagnosis: from rabies, cerebral congestion, immobility, influenza. _Cattle._ Symptoms: evidence of trauma, indigestion, lead poisoning, narcotism, parasitism; dullness, stupor, somnolence, stertor, grinding teeth, spasms, twitching, restless movements, blindness, violent actions, bellowing, hebetude, palsy. Relation to causation. _Sheep_: Symptoms. _Swine_: Symptoms. _Dog_: Symptoms. Diagnosis from rabies. Treatment: quiet, darkness, coolness, restraint, ice or cold irrigation, elimination, derivation, depletion, diuretics, potassium iodide, antipyretics, laxative diet, cool water, evacuate abscess. _Cattle_, similar, saline laxatives, for lead sulphuric acid, for cœnurus, operation, for œstrus, benzine. _Dog_, parallel treatment, milk diet or gruels, for linguatula, benzine. The inflammatory affections in the cranial cavity have been divided primarily into the following: 1. _Meningitis._ Inflammation of the coverings of the brain, and 2. _Encephalitis_ (_Cerebritis_). Inflammation of the nervous substance. These are further subdivided into: _A._ _Pachymeningitis._ Inflammation of the dura Mater. _B._ _Leptomeningitis._ Inflammation of the pia Mater. _C._ _Purulent Meningitis._ _D._ _Serous Meningitis._ _E._ _Tubercular Meningitis._ _F._ _Traumatic Meningitis_, etc.