. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. Lakes Temporary Phenomena 6l pushed about by the ice floes of spring, and scattered by every stunmer storm, but after every shift they set- tle again at lower levels. Always they are advancing and filling the lake basin. The filling may seem slow and insignificant on the shore of one of the Great Lakes but its progress is obvious in a mill pond, and the dif- ference is only Fig. 12. An eroding blufif on the shore of Lake Michigan that is receding at the rate of seve
. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. Lakes Temporary Phenomena 6l pushed about by the ice floes of spring, and scattered by every stunmer storm, but after every shift they set- tle again at lower levels. Always they are advancing and filling the lake basin. The filling may seem slow and insignificant on the shore of one of the Great Lakes but its progress is obvious in a mill pond, and the dif- ference is only Fig. 12. An eroding blufif on the shore of Lake Michigan that is receding at the rate of several feet each year. The broad shelving beach in the fore- ground is sand, where the waves ordinarily play. Against the bare rising boulder-strewn strip back of this, the waves beat in storms; at its summit they gather the earth-slides from the bank above and carry them out into the lake. The black strip at the rear of the sand is a line of insect drift, deposited at the close of a midsummer storm by the turning of the wind on shore. On the other hand, lakes disappear with the cutting down of the rim of their basins in outflow channels. The Niagara river, for example, is cutting through the lime-. 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; Lloyd, John Thomas, 1884- joint author. Ithaca,N. Y. , The Comstock Publishing Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1915
