. Biology; the story of living things. THE BTOLOGICAI. CONQUEST OF 'll||.; Woiuh .'.'». II riijhl I'll rci The Russian thistle {Salsolu) introduced into this country in 1!571. Today it covers the entire country. What adaptations have enabled this pesi to do tliis? In the world of attached animals, like sea-anemones and corals, that apparently are doomed to remain in one place, the free-swimming larvae seize the opportunity to break away from the maternal apron- strings before settling down for life, just as stationary plants by means of spores, seeds, and chmbing or trailing vegetative parts a
. Biology; the story of living things. THE BTOLOGICAI. CONQUEST OF 'll||.; Woiuh .'.'». II riijhl I'll rci The Russian thistle {Salsolu) introduced into this country in 1!571. Today it covers the entire country. What adaptations have enabled this pesi to do tliis? In the world of attached animals, like sea-anemones and corals, that apparently are doomed to remain in one place, the free-swimming larvae seize the opportunity to break away from the maternal apron- strings before settling down for life, just as stationary plants by means of spores, seeds, and chmbing or trailing vegetative parts are enabled to shift about and occupy new territory. Seeds of orchids and certain spores of fungi, mosses, and ferns, for example, are light as dust and may be wafted hundreds of miles in the air before settling down to germinate on some distant soil. Seeds of dandelions and other plants, such as milkweed, willow, and cottonwood, have feathery paracluite- like structures, which support them in the air for some time, e\-en in a wind blowing only two miles an hour. Insects, ballooning spiders, and birds make use of air currents, sometimes being carried long distances, particularly by heavy winds. Whole plants, like the Russian lliistl(\ and the "resurrection plants" of desert regions, may dry uj) and break loose from their anchoring roots, and roll along the ground or ride the breeze scattering their seeds, thus taking root in newly invatknl regions. H. w. H. — 4. 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 Hunter, George W. (George William), 1873-1948; Walter, Herbert Eugene, b. 1867; Hunter, George W. (George William), 1902-. New York, Cincinnati [etc. ] American book company
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Keywords: ., bookauthorwalterherberteugeneb1867, bookcentury1900, bookpublish
