A manual of the injuries and surgical diseases of the face, mouth and jaws / By John Sayre Marshall.

  • Marshall, John Sayre, 1846-1922.
Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: A manual of the injuries and surgical diseases of the face, mouth and jaws / By John Sayre Marshall. 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.

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    The spore possesses an exceedingly dense enveloping membrane, which protects it from deleterious external influences until such time as it finds a soil favorable to its growth and development. The cell is usually enlarged in the center or at one end by the presence of the Fig. 12. Spirillu Spirilli Cilia. >; 1250. spore, and when the latter reaches its full development, gelatinous softening of the cell-membrane takes place, the cell breaks up, and the spore is set free. During the process of development of the spore into a bacillus it loses its tough enveloping membrane and is therefore more readily destroyed. The majority of bacteria grow at a temperature of 37° 0.^98° F. Spores resist the action of germicidal agents to a much greater degree than the bacilli which produce them. Mature bacteria cannot resist a temperature of y7° C, 170° F. Most of them are destroyed when exposed to 55° C, 131° F., while spores have been known to resist a temperature of 100° to 120° C, 212° to 236° F. A