Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . Fig. 38.—Colony of Bacillusmesentericus vulgatus. SOME COMMON BACTERIA SLIGHTLY PATHOGENIC 99 Spores.^Are very resistant; are colored in the mannerdescribed in first part of the book for spores in general. Bacillus Megateritom (de Bary) (Fig. 39).—Origin.—Found on rotten cabbage and garden-soil. Form.—^Large rods, four times as long as they are broad, ju. Thick, rounded ends. Chains with ten or more mem-bers often formed; granular cell contents. Abundant spore format
Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . Fig. 38.—Colony of Bacillusmesentericus vulgatus. SOME COMMON BACTERIA SLIGHTLY PATHOGENIC 99 Spores.^Are very resistant; are colored in the mannerdescribed in first part of the book for spores in general. Bacillus Megateritom (de Bary) (Fig. 39).—Origin.—Found on rotten cabbage and garden-soil. Form.—^Large rods, four times as long as they are broad, ju. Thick, rounded ends. Chains with ten or more mem-bers often formed; granular cell contents. Abundant spore formation; very slow movement. Growth.—Strongly aerobic; grows quickly and best at atemperature of 20° Fig. 39.—Bacillus megaterium, with spores. Plate Colonies.—Small, round, yellow points in the depth ofthe gelatin. Under microscope, irregular masses like Stab-culture.—Funnel-shaped from above downward. Potato.—Thick growth with abundance of spores like Bacillus Ramosus.—Synonyms.—Bacillus mycoides(Fliigge); Wurzel or root bacillus. Origin.—In the upper layers of garden or farm grounds andin water. Form.—Short rods, with rounded ends, about three timesas long as they are thick; often in long threads and chains. 100 ESSENTIALS OF BACTERIOLOGY —Gram. Agar Stroke.—Gray soft mass, gnarled and twisted; feath-ery extensions spreading over entire surface. Gelatin Stab.—Arborescent and plumose-parallel projectionson either side of the stab; a thick skin on surface with slowliquefaction (Fig. 40). Colonies.—Twisted threads, like a bundle of hair; opaquecenter; the threads or branches divide endlessly, forming —At ord
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