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PLATE VII.
Fig. A.— B. subtilis. Sewage variety A. Gelatine "stab" cultures—
(a) Two days' growth at 20° C. (b) Three days' growth at 20° C. (c) Four days' growth at 20° C.
Fig. B.—B. subtilis. Sewage variety A. Colony in a gelatine plate under a low power of the
microscope. Two days' growth at 20° C.
(Diagrammatic.)
Fig. C.—B. subtilis. Sewage variety B. Gelatine "stab"
cultures—
(а) Two days' growth at 20° C.
(b) The same at a later stage.
Fig. D.—B. subtilis. Sewage variety B. Blood serum
culture. Forty-eight hours' growth at 20° C.
(Diagrammatic.)