Flowers, Fruits and LeavesMacmillan, 1886 - 147 páginas |
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Página 3
... observed in more than one in- stance that this was the case , but he did not altogether appreciate the importance of the fact . Mr. Darwin , however , has not only made it clear from theoretical considerations , but has also proved it ...
... observed in more than one in- stance that this was the case , but he did not altogether appreciate the importance of the fact . Mr. Darwin , however , has not only made it clear from theoretical considerations , but has also proved it ...
Página 4
... observation on insect - eating flowers was made about the year 1768 , by our countryman Ellis . He observed that in Dionæa , a North American plant , the leaves FIG . 4.- -Drosera rotundifolia have a joint in the middle , and thus close ...
... observation on insect - eating flowers was made about the year 1768 , by our countryman Ellis . He observed that in Dionæa , a North American plant , the leaves FIG . 4.- -Drosera rotundifolia have a joint in the middle , and thus close ...
Página 6
... observed that these honey - guides are absent in night flowers , where they of course would not show , and would therefore be useless , as for instance in Lychnis vespertina or Silene nutans . Night flowers , moreover , are generally ...
... observed that these honey - guides are absent in night flowers , where they of course would not show , and would therefore be useless , as for instance in Lychnis vespertina or Silene nutans . Night flowers , moreover , are generally ...
Página 8
... observations that have been made , that half a dozen pollen grains are sufficient to fertilise a seed . But in plants in ... observed the clouds of pollen produced by the Scotch fir . In such flowers as the Pæony the pollen is carried by ...
... observations that have been made , that half a dozen pollen grains are sufficient to fertilise a seed . But in plants in ... observed the clouds of pollen produced by the Scotch fir . In such flowers as the Pæony the pollen is carried by ...
Página 9
... observed by Sprengel . in Epilobium angustifolium as long ago as 1790 ; in some cases the stigma has matured before the anthers are ripe , while in other and more numerous cases the anthers have ripened and shed all their pollen before ...
... observed by Sprengel . in Epilobium angustifolium as long ago as 1790 ; in some cases the stigma has matured before the anthers are ripe , while in other and more numerous cases the anthers have ripened and shed all their pollen before ...
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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,...