A manual of hygiene and sanitation / By Seneca Egbert.

  • Egbert, Seneca, 1863-1939.
Date:
[1907], [©1907]
Catalogue details

Licence: Public Domain Mark

Credit: A manual of hygiene and sanitation / By Seneca Egbert. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

    42/500 (page 46)
    gelatin has a melting-point below the temperature of the human body, while that of agar is above; consequently we employ the latter when it is desired to cultivate germs that grow best at the body temperature, although the develop- ment of most bacteria is usually more rapid and charac- teristic upon gelatin. Blood-serum, sterilized and solidi- fied, is also used for the cultivation of certain organisms, Fig. 7. Arnold steam sterilizer. such as the diphtheria bacillus; and there are certain others which can best be identified by their difference in growth upon boiled potato, milk, etc. The differentiation of the various species of bacteria is to be made by noting their appearance and form under the microscope, wliethcr they are motile or not, how tliey take different stains, etc.; by observing their methods of growth in or upon different culture-media, and the color and appearance of the colonics; by noting whether tlujy