Composition Of Soil Air
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The composition of the air in the soil is variable, and differs widely frmo that of the free atmosphere. Carbonic acid in variable quantity is usually one of its constituents. The origin of this gas is supposed to be due to organic changes taking place in the soil itself. It cannot be derived frmo water precipitated from the atmosphere, as the amount of this gas in meteoric water is exceedingly small. Nor is it to be sought for in the ground-water as a source; but it most likely derived from the soil, and is imparted to the ground-water and ground-air simultaneously, but more freely to the latter on account of its greater absorbent capacity.
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