A manual of bacteriology / by Herbert U. Williams.

Date:
1901
Catalogue details

Licence: In copyright

Credit: A manual of bacteriology / by Herbert U. Williams. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    they are cooled while in an inclined position, and are sterilized between 65° and 70° C. by the fractional method on six consecutive days. They are afterward tested in the ■incubator for two days. The colonies of the gonococcus are very small, grayish- white, circular, translucent; appearing after from twenty- four to forty-eight hours. They may attain a diameter of I to 2 mm. The gonococcus will occasionally develop on ordinary glycerin-agar or Loffler’s blood-serum medium, but the growth is likely to be feeble and cannot be relied on. The cultures live for a considerable time if kept from drying. The gonococcus is not known to produce ure- thritis or conjunctivitis in any of the lower animals. In the peritoneum it may cause suppurative inflammation in mice and guinea-pigs. Reproduction of the disease in man has been effected by experimental inoculation with pure cultures. Besides being the cause of gonorrheal ure- thritis, the gonococcus has been isolated from cases of vaginitis in women and little girls, and from gonorrheal conjunctivitis. It has been found to be the cause of man}' cases of pyosalpinx, as well as of gonorrheal proctitis, ar- thritis, m3mcarditis and endocarditis ; these conditions com- plicating gonorrhea may also be secondaiy or mixed in- fections. Bacillus pneumoniae (of Friedlander).—A short bacillus with rounded ends, sometimes growing out to a greater length ; sometimes occurring in pairs; surrounded b}' a capsule which is only seen in preparations made from the tissues of infected animals, and is not demonstrated in cul- tures. This bacillus is not motile. It does not form spores. It stains with the ordinary aniline dyes, but does not stain by Gram’s method. It is aerobic and facultative anaerobic. It may be cultivated at ordinary temperatures, but grows better in the incubator. It does not liquefy gelatin. Stick- 19