The micro-organisms in air have formed the subject of investigations by Pasteur, Tyndall, Miquel, and many others. The researches of these experimenters have shown that although these organisms are most widely distributed throughout the accessible regions of the atmosphere, yet that very marked differences do exist in the numbers which are present in different places, and in the same places at different times.
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Percy Faraday Frankland (1886) studied this question.
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