. The formation of vegetable mould, through the action of worms, with observations on their habits. Earthworms; Humus; Soils; 1896. Chap. III. UNDERMINED BY WORMS. 151 side, forming a shallow crateriform hollow, was left^ the inner surface of which consisted of fine hlack mould, excepting where the more protuberant parts rested on the brick- tubbish. A transverse section of this stone, together with its bed, drawn from measure- made after it had been displaced, is here given on a scale of J inch to a foot (Fig. 6). The turf-covered border Fig. 6. Transverse section across a larg
. The formation of vegetable mould, through the action of worms, with observations on their habits. Earthworms; Humus; Soils; 1896. Chap. III. UNDERMINED BY WORMS. 151 side, forming a shallow crateriform hollow, was left^ the inner surface of which consisted of fine hlack mould, excepting where the more protuberant parts rested on the brick- tubbish. A transverse section of this stone, together with its bed, drawn from measure- made after it had been displaced, is here given on a scale of J inch to a foot (Fig. 6). The turf-covered border Fig. 6. Transverse section across a large stone, which had lain on a grass-field for 35 years. A A, general level of the field. The underlying brick rubbish, has not been represented. Scale i inch to one foot. sloped up to the stone, consisted of fine vegetable mould, in one part 7 inches in thickness. This evidently consisted of worm- castings, several of which had been recently ejected. The whole stone had sunk in the thirty-five years, as far as I could judge, about 1J inch; and this must have been due 11. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Charles, 1809-1882; D. Appleton and Company. pbl. New York, D. Appleton and company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectsoils, bookyear1896
