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" It has been recognized since the dawn of microbiology that the soil is inhabited by a living microscopic population which is responsible for the numerous reactions that take place in the soil and that affect the life and economy of man in many ways. "

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" From the moment he is born to the moment he dies, man is subject to the activities of numerous microbes. "

" Streptomycin belongs to a group of compounds, known as antibiotics, which are produced by microorganisms and which possess the property of inhibiting the growth and even of destroying other microorganisms. "

" In the development of antibiotics, the soil microbiological population has contributed more than its share. It is to the soil that the microbiologists came in search of new antibacterial agents. "

" In learning to utilize antibiotics for the control of human and animal diseases, the medical and veterinary professions have acquired powerful tools for combating infections and epidemics. "

" The discovery of streptomycin as a product of a rather obscure group of microorganisms, the actinomycetes, led to the study of these organisms as potential producers of other chemotherapeutic substances. "

" The soil is not a mass of dead debris, merely resulting from the physical and chemical weathering of rocks; it is a more or less homogeneous system which has resulted from the decomposition of plant and animal remains. It is teeming with life. "

" With the exception of autotrophic bacteria, the green, or chlorophyll-bearing, plants are the only living forms on this planet capable of synthesizing organic matter out of inorganic elements and simple compounds. "