Finally other domestic animals may bring in an infection which becomes manifested by symptoms similar to those of hog cholera, and which if really different, yet serves to pave the way for such an outbreak. Galtier’s remarkable experience with a _pneumo-enteritis_ in sheep, introduced into five separate flocks by infected pigs from the same market, is significant in this respect. It is further significant that the hog cholera bacillus is a very protean microbe. Th. Smith, to whom we owe more than to any one else the identification of the germ, gives seven varieties, which showed well-marked distinctions in their morphology, in their modes of growth on culture media, in the amount of gas they respectively produced in a glucose bouillon, or in their pathogenesis for rabbits. One of these modified germs which has largely parted with its virulence for pigs and some other animals, may under specially favorable conditions, resume its former potency and proceed on a new career of infection. _Lesions in the Acute or Septicæmic Form._ The skin and subcutaneous fat are the seats of diffuse blotches or spots of a deep red varying from dark purple to light red, confined it may be to the inner sides of the arms and thighs the belly, the ears, eyelids, and muzzle, or it may be all but uniformly diffused over the body. When pressed so as to expel the blood, the greater part of the surface may be momentarily whitened, but red points remain representing the minute extravasations. Under the microscope the red points show tortuous and enlarged capillaries with here and there a rupture and minute clot. The visible mucosæ may show similar petechiæ, as may also the serosæ of the chest, cranium and abdomen. In the latter blood extravasations are liable to be more extensive. The spleen and lymph glands (particularly those of the bowels and omentum, the sublumbar and subdorsal regions) are usually enlarged, gorged with blood and softened. Many of the lymph glands may escape, and in others the congestion is largely confined to the cortical portion. The lungs may show petechiæ and even extensive hæmorrhages into their substance. The kidneys may show petechiæ in the glomeruli, the medullary substance, the papillæ or the pelvic mucosa, or there may be larger circumscribed hæmorrhages. The stomach in its greater curvature especially is usually deeply congested and petechiated, with small submucous extravasations, and these conditions are liable to be still more marked in the small intestines and especially in the large, which may have a dark red or port wine hue. Blood may be present in clots among the contents. Necrotic ulcers are absent.