The table on the next page will serve to place in contrast the differential phenomena of the diseases caused by bacilli of hog cholera, swine plague and swine erysipelas in uncomplicated infections. _Prevention._ As in all other contagious diseases, effective preventive measures imply the destruction of the pathogenic germ and all sanitary measures should aim at the early and final extinction of this organism and its subsequent exclusion from the country. This, however, entails an outlay and governmental control which it seems idle to expect in the very near future so that palliative measures, and those looking toward success over limited areas must still be resorted to. It should be here distinctly stated, however, that the extinction of a plague, though often the most expensive at the start, is in the end by far the most economical resort. _Removal of accessory causes._ The _health_ and _vigor_ of the animal exposed is not without its influence in case of attempted invasion by a virus of diminished potency. DIFFERENTIAL SYMPTOMS AND PHENOMENA. =Hog Cholera.= =Swine Plague.= =Rouget.= Incubation 6 days + Incubation 1 day to + Incubation 1 day Mucosæ not necessarily Mucosæ congested Mucosæ deeply congested congested, dark red, violet Petechiæ on snout, Petechiæ on snout, Petechiæ extensive eyes, mouth, etc. eyes, mouth, etc. Necrotic ulcers on Necrotic ulcers rare Necrotic ulcers less snout, mouth, skin, frequent etc. Furred tongue, vomiting Vomiting less likely Vomiting not uncommon common Temperature high in Temperature high in Temperature very high, acute cases (104° to acute cases 107° to 109° 108°) Lies on belly mostly, May lie on side May lie on side abdomen hot, tender Moves stiffly, feebly, Stiff but less so, Stiff, weak, paraplegic unsteadily with Paretic. grunting, may be paraplegic Bowels 1st costive, Diarrhœa less marked, Diarrhœa usually sets fæces molded, glazed; may be entirely in 2d or 3d day, or absent before death, diarrhœa, profuse, watery, fœtid, bloody, black on slops,—yellow on corn (maize) Everted anus dark red Anus may not be deep Anus may be less red, red, less everted less everted Cough often present, Cough, hard, frequent; Cough absent, save in hurried breathing wheezing breathing. latter stages with Auscultation and pulmonary percussion may show consolidation lung consolidation toward lower border. May bleed from nose