I have also found that the visits of bees are necessary for the fertilization of some kinds of clover; for instance, 20 heads of Dutch clover (Trifolium repens) yielded 2,290 seeds, but 20 other heads protected from bees produced not one. The Physical Basis of Society - الصفحة 58بواسطة Carl Kelsey - 1916 - عدد الصفحات: 406عرض كامل - لمحة عن هذا الكتاب
| 1898 - عدد الصفحات: 908
...years there would be nearly nineteen million elephants alive, descended from the first pair. "I have found that the visits of bees are necessary for the fertilization of some kinds of clover; for instance, twenty heads of white clover (Trifolium repens) yielded 2,290 seeds, but twenty other... | |
| David Starr Jordan - 1898 - عدد الصفحات: 454
...nearly nineteen million elephants alive, descended from the first pair." Darwin continues: "I have found that the visits of bees are necessary for the fertilization of some kinds of to clover. , v J , , , ',. clover; for instance, twenty heads of Relation of bees h i rf (Trifolium... | |
| 1900 - عدد الصفحات: 1124
...to the fertilization of the heart's-ease (viola tricolor), for other bees do not visit this flower. I have also found that the visits of bees are necessary for the fertilization of some kinds of clover ; for instance, 20 heads of Dutch clover (Trifolium repeus) yielded ¿,'290 seeds, but 20 other heads,... | |
| David Starr Jordan, Vernon Lyman Kellogg - 1907 - عدد الصفحات: 526
...assuredly the merest trifle would give the victory to one organic being over another." Darwin says: "I have found that the visits of bees are necessary for the fertilization of some kinds of clover; for instance, twenty heads of white clover (Trifolium repeim) yielded two thousand two hundred and... | |
| David Starr Jordan - 1907 - عدد الصفحات: 610
...nearly nineteen million elephants alive, descended from the first pair." Darwin continues: " I have found that the visits of bees are necessary for the fertilization of some kinds of clover; for instance, twenty heads of Relation of bees wh i clover , Tri f olium re p em \ yielded to clover.... | |
| John Arthur Thomson - 1910 - عدد الصفحات: 410
...not visit this flower. I have also found that the visits of bees are necessary for the fertilisation of some kinds of clover — thus, 100 heads of red...number of protected heads produced not a single seed. Humble-bees alone visit red clover, as other bees cannot reach the nectar. . . . Hence we may infer... | |
| Robert William Hegner - 1910 - عدد الصفحات: 496
...plants and animals, remote in the scale of nature, are bound together by a web of complex relations." He found " that the visits of bees are necessary for the fertilization of some kinds of clover; for instance, twenty heads of Dutch clover (Trifolium repens) yielded 2290 seeds, but twenty other... | |
| Robert William Hegner - 1915 - عدد الصفحات: 528
...another. This may best be illustrated by Charles Darwin's story of the field mice and humble bees. Darwin found " that the visits of bees are necessary for the fertilization of some kinds of clover; for instance, twenty heads of Dutch clover yielded 2290 seeds, but twenty other heads, protected from... | |
| William Trufant Foster - 1917 - عدد الصفحات: 496
...wars have ceased, for the same reason and in the same way." — Norman Angell, in Arms and Industry. I "I have also found that the visits of bees are necessary for the fertilization of some kinds of clover. For instance, twenty heads of Dutch clover . . . yielded 2290 seeds, but twenty other heads protected... | |
| Richard Swann Lull - 1917 - عدد الصفحات: 826
...to the fertilization of the heartsease (Viola tricolor), for other bees do not visit this flower. He also found that the visits of bees are necessary for the fertilization of some kinds of clover; "for instance, twenty heads of Dutch clover (Trifolium repens) yielded 2290 seeds, but twenty other... | |
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