Not liquefy; membranous Produces acetic-acid Air. growth.

Not liquefy; small white points porcelain - like; slow.

Growth faster than above; appearance same.

Rapid growth; round, concentrically-arranged colonies; not liquefy. Liquefy rapidly; small yellow-gray colonies.

Slowly liquefying, forming a cone with rose-red color.

Slow growth in small white

colonies.

fermentation.

Kützing.

Pasteur.

Grotenfeldt.

Duclaux.

Slowly liquefy; gray col- Is colored by Gram's Vaginal secretion.

onies;

growth fairly

method.

rapid.

Bumm.