. A manual of bacteriology. Bacteriology. PATHOGENIC BACTERIA. 321 bottom of the tube. In bouillon to which a few minute drops of sterile oil, as cocoariut oil, have been added, a growth takes place from the under side of the oil drops. Such growths ex- tend down, and are called stalactite growths. The stalactites break off, with the slightest disturbance. Remarkable involution forms appear on agar containing 3 per cent, of common salt. The stalactite growths and the forms occurring on salt-agar are considered the most charac- teristic cultural peculiarities.*. Fig. 76.—Bacillus of bubonic pla
. A manual of bacteriology. Bacteriology. PATHOGENIC BACTERIA. 321 bottom of the tube. In bouillon to which a few minute drops of sterile oil, as cocoariut oil, have been added, a growth takes place from the under side of the oil drops. Such growths ex- tend down, and are called stalactite growths. The stalactites break off, with the slightest disturbance. Remarkable involution forms appear on agar containing 3 per cent, of common salt. The stalactite growths and the forms occurring on salt-agar are considered the most charac- teristic cultural peculiarities.*. Fig. 76.—Bacillus of bubonic plague.—(Yersin.) It is sometimes sensitive to drying, but may sometimes sur- vive prolonged drying. When spread in thin layers, it is killed in three to four hours by direct sunlight. Dried out on cotton and linen cloth the bacilli were found to be still alive after i8 hours exposure to sunlight. The action of sunlight is in direct proportion to the thinness of the layer into which the cultures are spread, being seriously hindered when the layer is thick, in a few minutes by steam at ioo° C. Rosenau states that it is killed in one hour by one per cent, carbolic acid, but others ?Wilson. Journal Medical Research. Vol. VI. 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 Williams, Herbert Upham, 1866-; Bolton, Benjamin Meade, 1857-1929. Philadelphia, P. Blakiston's Son & Co.
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