page 230.). Nevertheless the variety continues to be reproduced from seed, because in addition to the double and infertile flowers, the seeds always produce a certain number of single, fertile blossoms, and these are used to reproduce the double variety. These single and fertile plants correspond "to the males and females of an ant-colony, the infertile plants, which are regularly produced in large numbers, to the neuter workers of the colony."英文原著 · 《Darwin and Modern Science》
Flower-heads - Grayish-white, rarely pinkish, in a hard, close, flat-topped, compound cluster. Ray florets 4 to 6, pistillate, fertile; disk florets yellow, afterward brown, perfect, fertile. Stem: Erect, from horizontal rootstalk, 1 to 2 ft. high, leafy, sometimes hairy. Leaves: Very finely dissected (Millefolium = thousand leaf), narrowly oblong in outline. Preferred Habitat - Waste land, dry fields, banks, roadsides. Flowering Season - June-November. Distribution - Naturalized from Europe and Asia throughout North America.英文原著 · 《WILD FLOWERS》
24th June. THIS evening has been fertile in events. About three versts from Kislovodsk, in the gorge through which the Podkumok flows, there is a cliff called the Ring. It is a naturally formed gate, rising upon a lofty hill, and through it the setting sun throws its last flaming glance upon the world. A numerous cavalcade set off thither to gaze at the sunset through the rock-window. To tell the truth, not one of them was thinking about the sun. I rode beside Princess Mary. On the way home, we had to ford the Podkumok.英文原著 · 《A Hero of Our Time》
In these northern counties the industrial population is double or treble the agricultural. The fertile western counties of Pembroke and Anglesey come between the industrial and grazing counties in density of population.英文原著 · 《A Short History of Wales》
The sound of coopers' mallets rings through the skyey caves; for here, where Nature stints human industry of soil, the soil is everywhere tilled, and everywhere fertile.英文原著 · 《A Woman of Thirty》
Profits of stock fall because land equally fertile cannot be obtained, and through the whole progress of society, profits are regulated by the difficulty or facility of procuring food. This is a principle of great importance, and has been almost overlooked in the writing of Political Economists. They appear to think that profits of stock can be raised by commercial causes, independently of the supply of food.英文原著 · 《An Essay on Profits》