(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Children's Library | Biodiversity Heritage Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "Pathogenic Bacteria"

340                 PA THOGENIC BA CTERIA.

growth in bouillon and in peptone solutions is accompa-
nied by the production of indol.

The spirillum is pathogenic for mice, guinea-pigs, and
canary birds.

Spirillum Weibeli.—This spirillum (Fig. 95) was found
in 1892 by Weibel in spring-water which had a long time

FIG. 95.—Spirillum Weibeli, from agar-agar; x 1000 (Itzerott and Niemann).

before been infected by cholera. It is short, rather thick,
and distinctly bent, often forming S-shaped figures.

The colonies before liquefaction sets in are described
as pale-brown, transparent, circular, and homogeneous.
Liquefaction is much more rapid than in cholera, and
causes the borders of the colonies to become irregular.
In the centre of each colony a little depression is ob-
served.

In gelatin puncture-cultures the growth is rapid, be-
ginning first upon the surface, where a large flat, saucer-
shaped liquefaction, extending to the sides of the tube,
forms. Scarcely any growth takes place in the puncture,
but the superficial liquefaction, separated by a horizontal
line from the normal gelatin, descends slowly.

Upon agar-agar a grayish-white layer is formed.

No growth has been obtained upon potato.