Thermophilic bacteria : (second paper) / by Allan Macfadyen, M.D., and Frank R. Blaxall, M.D.

  • Macfayden, Allan, 1860-1907.
Date:
[1896?]
Catalogue details

Licence: In copyright

Credit: Thermophilic bacteria : (second paper) / by Allan Macfadyen, M.D., and Frank R. Blaxall, M.D. Source: Wellcome Collection.

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    Organism, non-motile, straight and curved rods, rounded ends, tendency to long thread formation; L. 4 to 8 Br. 1 fi. Gram:—Positive ; very small and terminal oval spore. Bacillus X. (from soil).—Dull white, circular colonies, about 2 to 8 m. in diameter, x 50, are characteristic, yellow¬ ish colour, and show two zones—an inner finely granular about three-fourths of colony, and an outer zone with deeply indented margin showing delicate lace-like appear¬ ance and fluting on surface (fig. 9). Organism, motile, numerous scattered rods, occasional chains, ends rounded; L. 6 to 10 fi, Br. 1*5 to 2 fi. Gram :—Positive ; large terminal and oval spore. Bacillus XI. (from soil).—Bound, dull white colonies with moist, glistening appearance. x 50, appear yellowish brown, spherical, smooth contour, contents finely granular and freckled with faint markings, which, by reflected light, appear as a delicate reticulum. Organism, non-motile, rods form long anthrax-like chains, straight and curved, ends rounded, about size of Hay bacillus. Gram :—Positive ; terminal and oval spore. Bacillus XII. (from soil).—Stellate, yellowish white colonies, x 50, appear yellowish white, and margin some¬ what resembles an anthrax colony on agar at blood heat (fig. 10). Organism, non-motile, forms long chains, ends somewhat flattened; L. 4 to 8 n, Br. 1 to 2 fi. Gram :—Negative ; a drum-stick spore. Bacillus XIII. (from soil).—Bound, yellowish white colonies, x 50, appear spherical, brownish, finely granular with smooth contour, not very characteristic (fig. 11). Organism, non-motile, rods plump, square ends, form chains; L. 4 to 8 /a, Br. P5 to 2 fi. Gram :—Positive ; spore towards swollen end of bacillus. Bacillus XIV. (from soil).—Thin surface film over agar, discrete and circular colonies at margin, x 50, appear granular, smooth contour, somewhat resemble a ball of cotton wool (fig. 12). Organism, motile, short slender rods with rounded ends, surrounded by a zoogloea, no chains ; L. 4Br. 1 ^.