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Bacillus mesentericus. Lehm. and Neum. (B. mesen

tericus fuscus Flügge.)

I. Gelatin stab culture, two days at 22o.
II. Agar streak culture, three days at 22o.
III. Potato culture, one day at 22°. Natural size.
IV. Potato culture, five days at 22o. Natural size.

V. Agar plate, two days at 22o. Natural size.

VI. Agar stab culture, four days at 22°. Surface growth.

VII. Agar plate, two days at 22°. X 60. Above, superficial; below, deep colonies.

VIII. Gelatin plate, thirty-six hours at 22°. x 60. Deep colonies.

IX. Gelatin plate, thirty-six hours at 22o. x 60. Superficial colony.

X. Gelatin plate, two days at 22°. Natural size.

XI. Gelatin plate, one day at 22°. X 60. To the right, deep; to the left, superficial colonies.

XII. Microscopic preparation. X 800. From a pure culture on agar two days old. Stained with fuchsin. Some bacilli contain spores.

XIII. Bacilli with numerous flagella, X 1000. Stained by Löffler's method.

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Bacillus tetani. Nicolaier. (Tetanus Bacillus.)

I. Sugar-agar stab culture, three days at 37°.
II. Sugar-gelatin stab culture, six days at 22°.

III. Sugar-gelatin plate, four days at 22°. Grown without air.

IV. Sugar-gelatin plate, four days at 22°. X 60. Natural size. Superficial and deep colonies. Grown without air.

V. Sugar-agar plate, four days at 37°. Natural size. Grown without air.

VI. Sugar-agar plate, four days at 37°. X 60. Superficial and deep colonies. Grown without air.

VII. Microscopic preparation. Pure culture on sugaragar, three days at 370. X 1000. Bacilli with pores. Double staining according to Ziehl.

VIII. Microscopic preparation. Pure culture on sugaragar, two days at 37°. x 1000. Some bacilli contain spores. Stained with fuchsin.

IX. Microscopic preparation. Pure culture on sugaragar, twenty-four hours at 37° X 1000. Extremely long threads with faintly stained intervals.

X. Microscopic preparation. Pure culture on sugaragar, six days at 37°. X 1000. Stained with fuchsin. Long threads and chains of spores with faintly stained intervals.

XI. Microscopic preparation. . Flagella staining. Highly magnified.

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