. The pathology and differential diagnosis of infectious diseases of animals. Veterinary medicine -- Diagnosis; Communicable diseases in animals. 334 PNEUMONOMVCOSIS For ordinary use potato, with or without glycerin, gives excellent results. A paste made by rubbing up crumbs of stale bread in water is also a good medium. Growth is said to be more rapid, however, in Raulin's fluid than in any other medium, the mycelium appearing in from five to twelve hours and spores forming in from twelve to fifteen hours. The growth is first a velvety white, soon becoming a delicate bluish green, which grows
. The pathology and differential diagnosis of infectious diseases of animals. Veterinary medicine -- Diagnosis; Communicable diseases in animals. 334 PNEUMONOMVCOSIS For ordinary use potato, with or without glycerin, gives excellent results. A paste made by rubbing up crumbs of stale bread in water is also a good medium. Growth is said to be more rapid, however, in Raulin's fluid than in any other medium, the mycelium appearing in from five to twelve hours and spores forming in from twelve to fifteen hours. The growth is first a velvety white, soon becoming a delicate bluish green, which grows darker. On Raulin's fluid it changes after some days to a dark brown. Cultures on potato retain the green color for a long time, while those on bread paste become brown. The fungus retains its vitality in cultures for many months unimpaired. Its development has been reported when inoculated from cultures three or four years old. Spores do not form in a temperature below 20° C. and like the mycelium they require fresh access to oxygen for their best development. They measure to 3// in diameter. In nature the spores are widely distributed but seem to be especially abundant in grain and vegetable matter. They have considerable power of re- sistance to heat and to chemical agents. They are killed by a tem- perature of 60° C. in five and one- half hours. In moist heat and in solution of bichloride of mercury i to 1,000 they are destroyed in fifteen minutes. Aspergilhis fumigatiis is dif- ferentiated from other species by its color in cultures, the high tempera- ture at which it grows, the size of the spores and by its pathogenesis. Aspergillus giaucus is the one most likely to be confounded with it. It may be differentiated from A. fumi- _gatus by its ability to grow at low temperature, its delicate green color, the large diameter of its spores—9 to 15/^—and its lack of pathogenic Fig. 86. Aspergillus fumi- gatus i?! Please note that these images are extra
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