Abstract
The question of the presence or absence of micro-organisms in the normal organs of the body has occupied the attention of numerous observers; yet, despite the fact that its solution is not accompanied by any great difficulties, the results of experimentation have been strangely at variance. For instance, Meissner stated that no bacteria capable of development are present in the living tissues of the healthy animal, while Zweifel (1885) expressed the opposite opinion, namely, that human organs habitually contain germs, that these germs, however, are anaerobic in character, their capability of development being limited by the amount of oxygen present in the blood stream.

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