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
| Robert Bird - 1870 - عدد الصفحات: 262
...locality, as we have seen when relating the influence of trees. Again, the same author says, "I have found that the visits of bees are necessary for the fertilization of some kinds of clover; for instance, 20 heads of Dutch clover yielded 2290 seeds, but 20 other heads protected from bees produced... | |
| Dr. Schmidt (Eduard Oskar), Oscar Schmidt - 1875 - عدد الصفحات: 362
...indispensable to the fertilization of the heartsease (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 repens) yielded 2,290 seeds, but 20 other heads,... | |
| Oscar Schmidt - 1875 - عدد الصفحات: 356
...indispensable to the fertilization of the heartsease (Viola tricolor), for othef 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, 2O heads of Dutch clover (Trifolium repens) yielded 2,290 seeds, but 20 other heads,... | |
| William Swinton, George Rhett Cathcart - 1880 - عدد الصفحات: 364
...heart's-ease, for other bees do not visit this flower. 3. From experiments which I have lately tried I have 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 Swinton, George Rhett Cathcart - 1880 - عدد الصفحات: 346
...heart's-ease, for other bees do not visit this flower. 8. From experiments which I have, lately tried I have 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... | |
| Charles Darwin - 1884 - عدد الصفحات: 396
...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 repens) yielded 2,290 seeds, but 20 other heads... | |
| Sir Patrick Geddes - 1893 - عدد الصفحات: 298
...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... | |
| Alphonso Gerald Newcomer - 1893 - عدد الصفحات: 284
...indispensable to the fertilization of the heartsease (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 repens) yielded 2290 seeds, but 20 other heads... | |
| Fred Newton Scott, Joseph Villiers Denny, Joseph Villiers Denney - 1909 - عدد الصفحات: 494
...highwaymen of which there is a superabundance than by wasting it on tipping cases. (&) I have always 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 frotn... | |
| Elias J. MacEwan - 1898 - عدد الصفحات: 440
...indispensable to the fertilization of the heartsease (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 repens) yielded 2290 seeds, but 20 other heads protected... | |
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