Abstract

THE world in which we live is inhabited by a multitude of microscopic forms of life that we commonly refer to as microbes. They comprise the bacteria, the fungi or the molds, the protozoa and other microscopic animal forms, and the ultramicroscopic forms known as viruses. These microbes are devoid of chlorophyll, and are thus unable to utilize the energy of sunlight; they have to depend, therefore, for their nutrition, upon the preformed organic materials in the form ot living matter or dead plant and animal residues; only few of the microbes are able to synthesize their cell substance from simple inorganic elements and compounds. Microbes bear an intimate relation to the cycle of life in nature, and thus affect our health, our food supply, our shelter and clothing, and many of our industrial processes. Microbes vary greatly in their structure, in appearance, and mode of living. Some prefer one kind of food and ...

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