. The natural history of the farm; a guide to the practical study of the sources of our living in wild nature. Natural history. NATURE'S SOIL-CONSERVING OPERATIONS 177 little patches of mosses or other low herbage, but nearly all the levels are overspread with leaves, and under the leaves is leaf-mold. Here is humus in the making. Let us examine the bed of leaf mold. On top, the leaves are weU preserved. and show clearly by their form on what kinds of trees they. Fig. 69. A skeletonized leaf of Cottonwood. grew. Some leaves, such as those of oaks, that contain much tannin are resistant to deca
. The natural history of the farm; a guide to the practical study of the sources of our living in wild nature. Natural history. NATURE'S SOIL-CONSERVING OPERATIONS 177 little patches of mosses or other low herbage, but nearly all the levels are overspread with leaves, and under the leaves is leaf-mold. Here is humus in the making. Let us examine the bed of leaf mold. On top, the leaves are weU preserved. and show clearly by their form on what kinds of trees they. Fig. 69. A skeletonized leaf of Cottonwood. grew. Some leaves, such as those of oaks, that contain much tannin are resistant to decay, and those of two seasons may remain unrotted. But other leaves, such as those of elm, decay so quickly that they wiU not outlast the first winter. In some, such as those of maple and cottonwood (fig. 69), the veins resist decay so much longer than the blade that the leaves become beautifully skeletonized. In the lower strata. 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 Needham, James G. (James George), 1868-1956. Ithaca, N. Y. , The Comstock Publishing Company
Size: 1632px × 1531px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
