Flowers, Fruits and LeavesMacmillan, 1886 - 147 páginas |
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Página 28
... protected . The arrangement in the Sweet Pea is very similar , and if the wings are seized by the fingers , and pressed down , this out - pumping of the pollen may be easily effected , and the mechanism will then be more clearly ...
... protected . The arrangement in the Sweet Pea is very similar , and if the wings are seized by the fingers , and pressed down , this out - pumping of the pollen may be easily effected , and the mechanism will then be more clearly ...
Página 35
... protected in this manner from browsing quadrupeds , but not the less do our ants perform for them a very similar function , by keeping down the number of small insects , which would otherwise rob them of their sap and strip them of ...
... protected in this manner from browsing quadrupeds , but not the less do our ants perform for them a very similar function , by keeping down the number of small insects , which would otherwise rob them of their sap and strip them of ...
Página 37
... protect themselves from the unwelcome visits of such intruders . The most frequent are the interposition of chevaux de frise , which ants cannot penetrate , glutin- ous surfaces which they cannot traverse , slippery slopes which they ...
... protect themselves from the unwelcome visits of such intruders . The most frequent are the interposition of chevaux de frise , which ants cannot penetrate , glutin- ous surfaces which they cannot traverse , slippery slopes which they ...
Página 39
... protected by any special arrange- ment of the flower itself , and is accessible even to very small insects . The stamens ripen before the pistil , and any flying insect , however small , coming from above , would assist in cross ...
... protected by any special arrange- ment of the flower itself , and is accessible even to very small insects . The stamens ripen before the pistil , and any flying insect , however small , coming from above , would assist in cross ...
Página 48
... protect the seeds , not only by their thickness and toughness , but also by their bitter taste , as , for instance , in the Walnut . The genus Mucuna , one of the Leguminosæ , is remark - able in having the pods covered with stinging ...
... protect the seeds , not only by their thickness and toughness , but also by their bitter taste , as , for instance , in the Walnut . The genus Mucuna , one of the Leguminosæ , is remark - able in having the pods covered with stinging ...
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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,...