PLATE 37.

Bacillus mycoides. Flügge. (Root Bacillus.)

I. Gelatin stab culture, four days at 22°.
II. Gelatin stab culture, fourteen days at 22°.
III. Agar streak culture, two days at 22°.

IV. Agar stab culture, eight days at 22°. Stab canal.
V. Agar stab culture, eight days at 22°.

growth.

VI. Gelatin plate, one day at 22°. VII. Agar plate, one day at 22°. VIII. Agar plate, four days at 22°.

IX. Gelatin plate, four days at 22°. colony is at the point of sinking in.

Natural size.
Natural size.
Natural size.

Surface

Natural size. The

PLATE 38.

Bacillus mycoides. Flügge. (Root Bacillus.)

I. Agar plate, one day at 22°. × 20. Superficial and deep colony.

II. Potato culture, seven days at 22°.

Natural size. III. Microscopic preparation. Pure culture, twentyfour hours old, on agar. × 1000. Stained with fuchsin. A few bacilli contain spores.

X 100. Part of a

IV. Agar plate, one day at 22°. × 100. superficial colony.

Bacillus butyricus. Hüppe. (Butyric Acid Bacillus.)

V. Potato culture, three days at 22°.

VI. Gelatin plate, one day at 22°. X 60. Above, superficial; below, deep colonies.

VII. Gelatin plate, thirty-six hours at 22°. × 60. Part of a superficial colony.

VII A. Flagella preparation. X 1000. Stained according to Löffler.

VII A.

Bacillus vulgatus. Migula. (B. mesentericus vulgatus Flügge. Potato Bacillus.)

VIII. Potato culture, five days at 22°.

IX. Potato culture, five days at 22°. Natural size. Both forms of growth occur.