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Fig 12.—"Sewage proteus"; gelatine plate culture, two days' growth at 20° C. About natural size.
Fig. 13.—"Sewage proteus." From left to right—gelatine "shake" culture, 24 hours at 20° C.; gelatine
"stab" culture, 24 hours' growth at 20° C.; gelatine "stab" culture, 48 hours' growth at 20° C. About natural
size.
Fig. 14.—B. frondosus. Microscopic double-stained preparation from an agar culture showing spores,
x 1,000.
Fig. 15.— B. frondosus. Gelatine plate culture. About natural size.
Fig. 16.—B. fusiformis. Microscopic double-stained preparation, showing spores. X 1,000.
Fig. 17.—B. subtilissimus. Impression preparation from a gelatine plate culture. X 1,000.
Fig. 18.—B. subtilissimus. Gelatine "streak" cultures, 24 hours' growth at 20° C. Natural size.
Fig. 19.— B. subtilis. Sewage variety B. gelatine "stab" cultures. 1 day's and 3 days' growth at 20° C.
About natural size.
Fig. 20.—B. subtilis. Sewage variety B. Oblique agar culture, 3 days' growth at 20° C. About natural size.
Fig. 21.—B. membraneus patulus. Impression preparation from gelatine plate culture. X 1,000.
Fig. 22.—B. membraneus patulus. Oblique gelatine culture. About natural size.
Fig. 23.—B. membraneus patulus. Gelatine "stab" culture, 3 days' growth at 20° C. About natural size.
Fig. 24.—B. capillareus. Impression preparation from a gelatine plate culture, 20 hours' growth at 20° C.
X 1,000.
Fig. A.—B. subtilis, sewage variety A. Gelatine "stab" culture—
(а) 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 gelatine plate, under low power of microscope—
Two days' growth at 20° C.
Fig. C.—B. subtilis, sewage variety B. Gelatine "stab" cultures—
(a) Two days' growth at 20° C.
(b)The same as (a) but at a later stage.
Fig. D.—B. subtilis, sewage variety B. Blood serum culture—
48 hours' growth at 20° C.
Fig. E.—B. membraneus patulus. Oblique gelatine culture.
Fig. F.—B. membraneus patulus. Showing the appearance, under a low power of the microscope, of the
delicate film-like processes which extend over the surface of the medium in gelatine plate cultures.
Fig. G.—B capillareus. Under a low power of the microscope.
(а) Deep-seated colony in gelatine, 20 hours' growth at 20° C.
(b) Colony partly deep and partly superficial, 20 hours' growth at 20° C.
(c) Colony at a later stage of growth, and after liquefaction had set in.