The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina vii
... result of any number of accidental and appa- rently at first " purposeless " variations . In a broad sense natural selection seemed obviously true ; for Geology had revealed the fact that the world had been peopled over and over again ...
... result of any number of accidental and appa- rently at first " purposeless " variations . In a broad sense natural selection seemed obviously true ; for Geology had revealed the fact that the world had been peopled over and over again ...
Pagina x
... result of the influence of the conditions of life . † In the last page of his work , Dr. Vines calls attention to Naegeli's view as follows : " Naegeli suggests , and his suggestion is worthy of serious consideration , that there is an ...
... result of the influence of the conditions of life . † In the last page of his work , Dr. Vines calls attention to Naegeli's view as follows : " Naegeli suggests , and his suggestion is worthy of serious consideration , that there is an ...
Pagina 2
... result of this method of investigation is undoubtedly Payer's Traité d'Organogénie Com- parée de la Fleur , published in 1857 : but if it be thought sufficient to limit the study of flowers to tracing their mor- phological development ...
... result of this method of investigation is undoubtedly Payer's Traité d'Organogénie Com- parée de la Fleur , published in 1857 : but if it be thought sufficient to limit the study of flowers to tracing their mor- phological development ...
Pagina 9
... result of the neglect of insects . Consequently inconspicuousness becomes a characteristic feature of self- fertilising flowers . By increased degradation the corolla may disappear entirely , as in Sagina apetala , some cleistogamous ...
... result of the neglect of insects . Consequently inconspicuousness becomes a characteristic feature of self- fertilising flowers . By increased degradation the corolla may disappear entirely , as in Sagina apetala , some cleistogamous ...
Pagina 20
... result is to check for a time the growth and development of the gynoecium of most insect - visited herma- phrodite flowers , i.e. to render the flower protandrous ; and I strongly suspect that the generally reduced number of carpels in ...
... result is to check for a time the growth and development of the gynoecium of most insect - visited herma- phrodite flowers , i.e. to render the flower protandrous ; and I strongly suspect that the generally reduced number of carpels in ...
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
Pasaje populare
Pagina 30 - II. Physics and Politics ; or, Thoughts on the Application of the Principles of "Natural Selection " and " Inheritance
Pagina 23 - REYNOLDS, Rev. JW— The Supernatural in Nature. A Verification by Free Use of Science. Third Edition, Revised and Enlarged, Demy 8vo, 14^.
Pagina 30 - XI. Animal Mechanism : a Treatise on Terrestrial and Aerial Locomotion. By Professor EJ Marey. With 117 Illustrations. Third Edition. Crown 8vo, 5^.
Pagina 17 - NEWMAN, JH, DD— Characteristics from the Writings of. Being Selections from his various Works. Arranged with the Author's personal Approval.
Pagina 29 - FIRST BOOK OF BOTANY. Designed to Cultivate the Observing Powers of Children. With 300 Engravings. New and Cheaper Edition. Crown 8vo.
Pagina 11 - HAWEIS, Rev. HR, MA— Current Coin. Materialism— The Devil — Crime — Drunkenness — Pauperism — Emotion — Recreation —The Sabbath.
Pagina 16 - MARKHAM, Capt. Albert Hastings, RN— The Great Frozen Sea : A Personal Narrative of the Voyage of the Alert during the Arctic Expedition of 1875-6.
Pagina 7 - COX, Rev. Sir GW, MA, Bart., and JONES, Eustace Hinton.— Popular Romances of the Middle Ages. Third Edition, in I vol. Crown Svo, 6s.
Pagina 21 - HDM SPENCE. Genesis. By the Rev. T. WHITELAW, MA With Homilies by the Very Rev. JF MONTGOMERY, DD, Rev. Prof. RA REDFORD, MA, LL.B., Rev. F. HASTINGS, Rev. W. ROBERTS, MA An Introduction to the Study of the Old Testament by the Venerable Archdeacon...
Pagina 26 - STRECKER- WISLICENUS.— Organic Chemistry. Translated and Edited, with Extensive Additions, by WR HODGKINSON, Ph.D., and AJ GREENAWAY, FIC Second and cheaper Edition. Demy 8vo, 12s. 6d. Suakin, 1885 ; being a Sketch of the Campaign of this year. By an Officer who was there.