SUMMARY. There is a daily fluctuation in the number of trophic forms of the three species of flagellates Oicomonas sp. (Martin), Cercomonas longicauda and Bodo sp., in the soil of arable fields. The numbers of bacteria and trophic amoebae in the soil are correlated, varying inversely over a period of 14 days. Temperature and rainfall appear to have no influence on the numbers of active protozoa in the soil.
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Cutler et al. (1920) studied this question.
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