Flowers, Fruits and LeavesMacmillan, 1886 - 147 páginas |
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Página 11
... tend to increase their chances of catching the pollen . Moreover , as Mr. Darwin has observed , there does not appear to be a single instance of an irregular flower which is not fertilised by insects or birds . The evidence derivable ...
... tend to increase their chances of catching the pollen . Moreover , as Mr. Darwin has observed , there does not appear to be a single instance of an irregular flower which is not fertilised by insects or birds . The evidence derivable ...
Página 44
... tends to find its own level ; animals and plants as constantly tend to adapt themselves to their conditions . For it is obvious that any blossom which differed from the form and size best adapted to secure the due trans- ference of the ...
... tends to find its own level ; animals and plants as constantly tend to adapt themselves to their conditions . For it is obvious that any blossom which differed from the form and size best adapted to secure the due trans- ference of the ...
Página 90
... tend to reach , the seed being the heaviest portion , point downwards . So the seed remains as long as it is dry , but if a shower comes on , or when the dew falls , the spiral unwinds , and if , as is most probable , the surrounding ...
... tend to reach , the seed being the heaviest portion , point downwards . So the seed remains as long as it is dry , but if a shower comes on , or when the dew falls , the spiral unwinds , and if , as is most probable , the surrounding ...
Página 123
... tend to become quite unarmed . In confirmation of this I may also adduce the fact that while in the Evergreen Oak the leaves on well - grown trees are entire and smooth - edged like those of the Laurel , specimens which are cropped and ...
... tend to become quite unarmed . In confirmation of this I may also adduce the fact that while in the Evergreen Oak the leaves on well - grown trees are entire and smooth - edged like those of the Laurel , specimens which are cropped and ...
Página 125
... tend to preserve the leaves from being eaten . In others , as Kerner has suggested , they serve to keep off insects - apparently with the special object of pre- venting the flowers from being robbed of their honey by insects which are ...
... tend to preserve the leaves from being eaten . In others , as Kerner has suggested , they serve to keep off insects - apparently with the special object of pre- venting the flowers from being robbed of their honey by insects which are ...
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Términos y frases comunes
Acacia advantage Agrimony allied animals anthers ants arrangement Beech bees belong branch canina capsule Cardamine carpel CHAP close colour common contrary corolla Crown 8vo curious Darwin Deadnettle dispersion distance Ditto Drosera Drosera rotundifolia edible Epilobium fertilised fertilised by insects flattened fleshy florets flower-head flowers Fritz Müller fruits genera genus Geranium Geranium dissectum Grant Allen ground grow Herb Herb Robert Hibiscus pedunculatus hirta honey hooks Hornbeam Horse Chestnut Illustrations inches insects instance internodes keel Lamium large number Lathyrus leaf-stalk leaflets leaves less light Lime lobed Maple maturity Moreover nearly observed ovary palmate perhaps petals pinnate pistil plants pods pollen Poplar produced protected resemblance ripe ripen scent Seedling seeds Senecio sepals small insects Spanish Chestnut species SQUIRTING CUCUMBER stalk stamens stamens and pistil stem stigma stomata surface Sycamore Thrincia throw trees tube upper Viola canina visited by insects wasp wind wings
Pasajes populares
Página 98 - But the leaves of the herbage at our feet take all kinds of strange shapes, as if to invite us to examine them. Starshaped, heart-shaped, spear-shaped, arrow-shaped, fretted, fringed, cleft, furrowed, serrated, sinuated; in whorls, in tufts, in spires, in wreaths endlessly expressive, deceptive, fantastic, never the same from footstalk to blossom ; they seem perpetually to tempt our watchfulness, and take delight in outstripping our wonder.
Página 117 - Here in the houseless wild, to direct the traveller's journey Over the sea-like, pathless, limitless waste of the desert.
Página 97 - Flowers seem intended for the solace of ordinary humanity : children love them ; quiet, tender, contented ordinary people love them as they grow; luxurious and disorderly people rejoice in them gathered : They are the cottager's treasure ; and in the crowded town, mark, as with a little...
Página 98 - Now. why is this marvellous variety, this inexhaustible treasury of beautiful forms ? Does it result from some innate tendency of each species? Is it intentionally designed to delight the eye of man ? Or has the form and size and texture some reference to the structure and organization, the habits and requirements, of the whole plant...
Página 3 - ... unknown until Mr. Darwin devoted himself to the subject. Our illustrious countryman was the first clearly to perceive that the essential service which insects perform to flowers, consists not only in transferring the pollen from the stamens to the pistil, but in transferring it from the stamens of one flower to the pistil of another. Sprengel had indeed observed in more than one instance that this was the case, but he did not altogether appreciate the importance of the fact. Mr. Darwin, however,...