Elementary botany (1898) Elementary botany elementarybotany00atki Year: 1898 CHAPTER LIL STRUGGLE FOR OCCUPATION OF LAND. 681. Retention of made soil.—In the struggle of plants for existence, there are a number of species which stand ready to rush in where new opportunities present themselves by changed conditions, or by newly made soil. The permanent drainage of ponds or marshes brings changed conditions, and the flora there Fig. 476. Made soil at mouth of stream, being overgrown by plants. Ithaca, N. Y. undergoes remarkable transformations. The deposits of the washings of streams in prot
Elementary botany (1898) Elementary botany elementarybotany00atki Year: 1898 CHAPTER LIL STRUGGLE FOR OCCUPATION OF LAND. 681. Retention of made soil.—In the struggle of plants for existence, there are a number of species which stand ready to rush in where new opportunities present themselves by changed conditions, or by newly made soil. The permanent drainage of ponds or marshes brings changed conditions, and the flora there Fig. 476. Made soil at mouth of stream, being overgrown by plants. Ithaca, N. Y. undergoes remarkable transformations. The deposits of the washings of streams in protected places along the shores, or at their mouths, where deltas or lateral plateaus are made by the accumulations of soil scoured off the banks of the stream, or washed off the fields during rains, make new ground. With such banks of newly made ground are deposited seeds carried along with the soil, or dropped there by the wind, by birds, or other agencies of seed distribution. 682. Figure 476 is from a photograph taken at the mouth of one of the streams emptying into Cayuga Lake. At the left is 374
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