. The diseases of poultry. Poultry. DISEASES OF POULTRY. 237 sion, in which case there is noticeable hyperaemia of the surface of the heart. The lungs are often, though not generall3^ engorged with dark blood; they are seldom, if ever, hepatized. The blood vessels are sometimes filled with a firm clot, and contain but little liquid ; at other times the blood does not coagulate at all. It seems to be those cases where the duration of the disease has been long- est, in which the blood loses its property of coagu- lation. The brain, in the case examined, was either normal or not very perceptibly
. The diseases of poultry. Poultry. DISEASES OF POULTRY. 237 sion, in which case there is noticeable hyperaemia of the surface of the heart. The lungs are often, though not generall3^ engorged with dark blood; they are seldom, if ever, hepatized. The blood vessels are sometimes filled with a firm clot, and contain but little liquid ; at other times the blood does not coagulate at all. It seems to be those cases where the duration of the disease has been long- est, in which the blood loses its property of coagu- lation. The brain, in the case examined, was either normal or not very perceptibly altered. The muscles at the seat of inoculation are generally reddened, though sometimes perfectly normal. Causation.— The cause of fowl cholera is a minute germ which under the microscope presents either a circular or oval outline. It is one of the bacteria and has been called by some a micrococcus, and by others a bacillus. It is about one fiftj^-thou- sandth of an inch broad and two or three times as long. It grows best at from 85 degrees to 105 degrees F. It has no power of movement, does not form spores, and is easily destroyed by drying, by the ordinary disinfectants, and by a temperature of 132 degrees F. for 15 minutes. In the experiments of the author it was found that the virus was destroyed by salicjdic acid 1 per cent;. Fig. 72.—BacUliof fowl Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Salmon, D. E. Washington, D. C. , G. E. Howard & co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpoultry, bookyear1899
