The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina vi
... produced by the conditions of life being gradual . In 1852 , Mr. Herbert Spencer " attributed the modifi- cations [ of species ] to the change of circumstances . ” In 1859 , " The Origin of Species " appeared . Mr. Darwin did not at ...
... produced by the conditions of life being gradual . In 1852 , Mr. Herbert Spencer " attributed the modifi- cations [ of species ] to the change of circumstances . ” In 1859 , " The Origin of Species " appeared . Mr. Darwin did not at ...
Pagina viii
... produce modifications . " Mr. Wallace adds that he had " arrived at almost exactly similar con- clusions . " In 1881 , when reviewing Paul Janet's work on " Final Causes , " I took occasion to remark that " I regarded the environment as ...
... produce modifications . " Mr. Wallace adds that he had " arrived at almost exactly similar con- clusions . " In 1881 , when reviewing Paul Janet's work on " Final Causes , " I took occasion to remark that " I regarded the environment as ...
Pagina 18
... producing such variations . The only interpretation that can be given is that the primary sym- metry having been originally determined by phyllotaxis , it ones . changes , whether in the individual or in 18 THE STRUCTURE OF FLOWERS .
... producing such variations . The only interpretation that can be given is that the primary sym- metry having been originally determined by phyllotaxis , it ones . changes , whether in the individual or in 18 THE STRUCTURE OF FLOWERS .
Pagina 43
George Henslow. the flower , through which nourishment is withdrawn at certain places to produce hypertrophy elsewhere . Thus the sepaline cord , instead of bearing an anther in Primula , bifur- cates at the angle , and each branch ...
George Henslow. the flower , through which nourishment is withdrawn at certain places to produce hypertrophy elsewhere . Thus the sepaline cord , instead of bearing an anther in Primula , bifur- cates at the angle , and each branch ...
Pagina 46
... producing the stamens of the same flower . The more correct way , therefore , of regarding the process would seem to be , first , to recognize the phyllo- tactical origin of the perianth as the basis to start from , and then to regard ...
... producing the stamens of the same flower . The more correct way , therefore , of regarding the process would seem to be , first , to recognize the phyllo- tactical origin of the perianth as the basis to start from , and then to regard ...
Alte ediții - Afișează-le pe toate
The Origin of Floral Structures Through Insect and Other Agencies George Henslow Vizualizare completă - 1893 |
The Origin of Floral Structures Through Insect and Other Agencies George Henslow Vizualizare completă - 1888 |
Termeni și expresii frecvente
adaptation to insect androecium anemophilous anthers appear arrested atrophy autogamy axial axis bear become bracts calyx capsules carpellary carpels cause cells character chorisis cleistogamous cleistogamous flowers colour condition corolla crossed Darwin degeneracy degradation Demy 8vo diclinism differentiated fact female flowers fertile fertilisation fibro-vascular cords filaments floral whorls florets foliaceous Forms of Flowers Fourth Edition genera genus grains hermaphrodite heterostyled hypertrophy Illustrations insect agency insects intercrossing irregular irritation Journ Labiata latter leaf leaves less long-styled form male flowers marginal mature Müller nature normally observed occur Orchids origin ovary ovules ovuliferous pedicel perianth petaline petals petioles phyllotaxis pistil placentas pollen pollen-tubes Primula produced protandrous protogynous Ranunculus receptacular tube regard remarkable result seedlings seeds seen self-fertilisation self-fertilised plants sepaline sepals short-styled form Small crown 8vo species spiral stamens stigmas structure style superposed temperature Teratology Third Edition tion tissue usually visited weight whorls
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