Emaciation advances with great rapidity, the patient arches the back, tucks up the abdomen, moves weakly and unsteadily or is unable to rise, and dies in one or several weeks, it may be quietly or in a state of coma, but usually without convulsions. _Symptoms in Subacute and Chronic Forms._ In this type the disease may be obscure, and even overlooked, so that infected animals carry the microörganism into fresh herds, without rousing a suspicion as to its true source. In other cases, after a slow and progressive development, it takes on such a distinct pathognomonic character that its diagnosis becomes more easy. In the slightest cases there may be only a capricious or irregular appetite, drooping tail, enlarged inguinal glands, and a progressive emaciation, with loss of life and strength and occasional irregularity of the bowels. The greasy exudation on the skin and black scaly encrustation is not uncommon. Such patients usually survive but they are liable to prove unthrifty and unprofitable. In other cases the pig becomes dull and listless, leaves its fellows, creeps and lies much under the litter, has impaired or irregular appetite, some costiveness followed by a fœtid diarrhœa, abdominal tenderness, enlarged inguinal glands, progressive emaciation, arched loins, hollow flanks, skin exudation, and oftentimes in the end erythematous eruption with petechiæ and black scaly exudate on the skin. It is in these protracted cases especially that the formation and detachment of the necrotic intestinal sloughs take place and these may pass in the fæces as flattened rounded masses or more extensive plaques. Necrotic ulcers are also liable to show on the buccal mucous membrane or skin. The patient may finally die of colliquative diarrhœa, of exhaustion and marasmus, in a state of coma as in the more acute cases. The mortality may be high and the survivors are liable to prove unthrifty and unprofitable. _Diagnosis._ With a group of plagues in swine bearing a strong family resemblance, and maintained by microörganisms, which, though maintaining distinct characters, yet show so much in common that it seems not impossible that they may have been originally derived from a common ancestor, and in face of the not infrequent complication of two of these microbes in one patient, it becomes a task of great difficulty to diagnose at once the particular outbreak that is met with in the field. In some outbreaks, however, the differential features are clear enough to allow the veterinarian to pronounce at once on the true nature of the disease. In others he must withhold his diagnosis until he can put it to the test of microscopic examination, bacteriological culture, the Widal test, or inoculation.