. Carnegie Institution of Washington publication. EFFECT OF DESICCATION. Organisms believed to be non-sporiferous show great differences, some being killed by an exposure of a few minutes or a few hours, while others remain alive for many weeks. For further information see the special chapters on Bacillus trache- ipliilus, B. carotavorus, Bad. hyacinthi, etc. Tests may also be made in air dried over sulfuric acid or calcium chloride. Harding & Pmcha have shown recently that Bacterium campcstre remains alive much longer when dried on cabbage seed than when dried on glass cover-slips. In the
. Carnegie Institution of Washington publication. EFFECT OF DESICCATION. Organisms believed to be non-sporiferous show great differences, some being killed by an exposure of a few minutes or a few hours, while others remain alive for many weeks. For further information see the special chapters on Bacillus trache- ipliilus, B. carotavorus, Bad. hyacinthi, etc. Tests may also be made in air dried over sulfuric acid or calcium chloride. Harding & Pmcha have shown recently that Bacterium campcstre remains alive much longer when dried on cabbage seed than when dried on glass cover-slips. In their experiments this organism was dead on glass at the end of ten days, but alive on seed at the end of thirteen months. EFFECT OF DIRECT SUNLIGHT. The exposures should be made in a thin stratum of nutrient agar, not sowed too thickly (there may be several hundred colonies on the plate, if properly distrib- uted), in thin-bottomed Petri dishes, to an unclouded sun for 5, 10, 15, 30, 45, and 60 minutes, a portion of the bottom of the plate, which is placed uppermost, being covered by some substance impervious to light, such as several folds of Manila paper. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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