. Bacteria in relation to plant diseases. Bacteria; Plant diseases. 56 BACTERIA IN RELATION TO PLANT DISEASES. They give a decidedly alkaline reaction to moist litmus paper and are not noticeably viscid (fourteenth day). On opening plates of this age they had a peculiar smell common to many bacteria (trimethylamin ?). The buried colonies are elliptical-pointed or spindle-shaped, and small. On slant peptonized beef-agar the organism makes a thin, rather scanty, wet-shining, pale yellowish growth which is sometimes scarcely distinguishable from the agar itself. In some streaks 5 days old the pen
. Bacteria in relation to plant diseases. Bacteria; Plant diseases. 56 BACTERIA IN RELATION TO PLANT DISEASES. They give a decidedly alkaline reaction to moist litmus paper and are not noticeably viscid (fourteenth day). On opening plates of this age they had a peculiar smell common to many bacteria (trimethylamin ?). The buried colonies are elliptical-pointed or spindle-shaped, and small. On slant peptonized beef-agar the organism makes a thin, rather scanty, wet-shining, pale yellowish growth which is sometimes scarcely distinguishable from the agar itself. In some streaks 5 days old the penholder was visible through three superposed tubes. The streak is finely granular under the hand-lens. A small amount of pale yellow precipitate forms in the fluid in the V and numerous prismatic crystals are sometimes present in the agar; 200 or more of these crystals were observed in a single tube. In beef-agar stab-cultures there was a variable growth in the stab, often fairly good the whole length, but always thinning out below and sometimes scanty. There was a good, wet-shining, pale yellow surface growth. In one set of tubes inoculated from slant agar and described the third day, the nail-head was 4 to 5 mm. in diameter, wet-shining, and maize yellow. The slime of very old cultures may be buff-yellow. The agar is not 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 Smith, Erwin F. (Erwin Frink), 1854-1927. Washington, Carnegie Inst.
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