. to i^ i* ^ IS u JJnrs. FIG. 3.âINCREASE IN NUMBER OF BACTERIA IN SOU, TREATED WITH PHENOL. f jund by the Protozoology Department at Rothamsted that, in a field soil, increases in the numbers of actively feeding amoeba; are accompanied by decreases in bacterial numbers, and vice versa. Now, the addition of a mild antiseptic to the soil disturbs this equili- brium between Protozoa and Bacteria, enabling the latter to increase. Thus Russell and Hutchinson found in 1909 that the addition of toluene to soil caused an increase in bacterial numbers and a corre- sponding increase in ammonia and nitr

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. to i^ i* ^ IS u JJnrs. FIG. 3.âINCREASE IN NUMBER OF BACTERIA IN SOU, TREATED WITH PHENOL. f jund by the Protozoology Department at Rothamsted that, in a field soil, increases in the numbers of actively feeding amoeba; are accompanied by decreases in bacterial numbers, and vice versa. Now, the addition of a mild antiseptic to the soil disturbs this equili- brium between Protozoa and Bacteria, enabling the latter to increase. Thus Russell and Hutchinson found in 1909 that the addition of toluene to soil caused an increase in bacterial numbers and a corre- sponding increase in ammonia and nitrate available to the plant as food. It is thus possible to increase the fertility of the soil by the addition thereto of a mild antiseptic. The study of the effect of adding these organic antiseptic compounds to the soil is therefore of import- ance, not only with a view to their use for destroying soil pests, but also because it promises to throw light.

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