. Agricultural bacteriology. Bacteriology, Agricultural. 166 THE SOIL FLORA acid is produced from sugar or glycerin. Some cultures have pro- duced growth and have acidified one or even all of the sugars. This suggests that the irregularity may be due to the poor growth in liquids, tested on "slants" of litmus agar, in fact, B. megatherium has been found to produce acid from dextrose and sucrose quite regularly. Similarly, its poor growth in broth raises a doubt as to whether the second figure of its group number (denoting it to be a strict aerobe) may be correct; for it grows so poor
. Agricultural bacteriology. Bacteriology, Agricultural. 166 THE SOIL FLORA acid is produced from sugar or glycerin. Some cultures have pro- duced growth and have acidified one or even all of the sugars. This suggests that the irregularity may be due to the poor growth in liquids, tested on "slants" of litmus agar, in fact, B. megatherium has been found to produce acid from dextrose and sucrose quite regularly. Similarly, its poor growth in broth raises a doubt as to whether the second figure of its group number (denoting it to be a strict aerobe) may be correct; for it grows so poorly even in the open arm of a fermentation tube that its failure to grow in the closed arm. «i- 0000000 FIG. 24.—B. megatherium. X 1000 diameters. (After Conn) does not necessarily prove its inability to grow in the absence of oxygen. It is also possible that its failure to reduce nitrates may be due merely to the fact that it grows poorly in nitrate broth. "B. mycoides Fliigge, 1886.—This is the most easily recognized of all the soil bacteria. It can readily be distinguished by its rhizoid growth on agar. "Morphology.—Young cultures consist of rods about to by 2 to 6 /I. They occur in long chains which often lie parallel and show false branching, an arrangement which gives the colonies. 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 Greaves, J. E. (Joseph Eames), b. 1880. Philadelphia New York, Lea & Febiger
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