The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools / by Alvin Davison.

  • Alvin Davison
Date:
[1908]
Catalogue details

Licence: Public Domain Mark

Credit: The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools / by Alvin Davison. 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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    other bacteria always found floating in the air. This was proved by phicing some broth in several jars, some of which, after being boiled to kill all life, were tightly sealed, while the others were left open. In a few days all of those re- maining open were found to contain numerous tiny living ■^■Qk^K|2^^ , ■-t/%;9^?9S^ ^» 1 1 ■ ^^^^^^^^^^H^ Pi 1 ■1 H B^^^^^^^^^^F^ . *jj ^1^ ni ^Ktsw-'j^ ^•^H ■ a* 4^ ^^ ft ..•'/^^ ■< ^^^H|^;' .'%< '»' m ^H 1 B '^'^ kIi^BB ^B^Hf< ^^'J^^m ^^^E ^Si^ ^1 ip' ^bH ■ 1 ^^NE^. ■<fVi--.^': EM s Fig. 25. — Mold growing on bread. The little knobs on the top of some . of the threads contain hundreds of tiny round bodies called spores or germs. These break loose and being blown cbout get on food and cause another growth of mold. and moving bodies. Even after weeks the sealed jars con- tained no life. The Nature of Bacteria. — Bacteria are one-celled plants. They are often called microbes or germs. Minute one-celled animals are also called microbes or germs. A piece of mold is sometimes spoken of as a germ. Molds differ from bac- teria in being much larger, forming long threads, and not dividing in the middle to produce new plants. Some molds are useful in giving flavor to cheese, others cause decay in any vegetable or animal material on which tbey grow, and
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