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Author : Charles Darwin
Publisher : Unknown
Page : 334 pages
File Size : 52,7 Mb
Release : 1892
Category : Fertilization of plants by insects
ISBN : NYPL:33433007351707
Author : Charles Darwin
Publisher : London : J. Murray
Page : 390 pages
File Size : 41,7 Mb
Release : 1862
Category : Science
ISBN : HARVARD:32044106378847
This 1862 publication describes the flower structure of orchids and their pollination to illustrate aspects of Darwin's evolutionary theory.
Author : Retha Edens-Meier,Peter Bernhardt
Publisher : University of Chicago Press
Page : 440 pages
File Size : 49,9 Mb
Release : 2014-11-05
Category : Biography & Autobiography
ISBN : 9780226044910
A quorum of scientists offer reviews and results to celebrate the 150th anniversary of 'On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects, And On The Good Effects Of Intercrossing' (1862). Authors of the first ten chapters follow research on the pollination and breeding systems of the same orchid lineages that interested Darwin, including temperate and tropical species. Authors on the last two chapters provide information on the floral attractants and flowering systems of orchids using protocols and technologies unavailable during Darwin's lifetime.
Author : Charles Darwin
Publisher : Unknown
Page : 336 pages
File Size : 54,8 Mb
Release : 1886
Category : Fertilization of plants
ISBN : HARVARD:RSLGDC
Author : Charles Darwin
Publisher : Unknown
Page : 416 pages
File Size : 51,8 Mb
Release : 1862
Category : Fertilization of plants
ISBN : BSB:BSB10301339
First edition of Darwin's primary work on plant fertilization. Detailing the relationship between the sexual structure of orchids and the insects that fertilize them, this was the first of three volumes that followed the publication of the Origin which contained supporting evidence for the author's theory of natural selection. Darwin concludes that plants are equal to animals in the marvels of their adaptation; for example, he observes that wind-pollinated flowers have no colours; it is only those insect-pollinated varieties that have bright coloured petals and sweet smelling nectars.
Author : Charles Darwin
Publisher : Unknown
Page : 328 pages
File Size : 52,8 Mb
Release : 1877
Category : Fertilization of plants
ISBN : STANFORD:36105041616793
Author : Charles Darwin
Publisher : Unknown
Page : 300 pages
File Size : 43,7 Mb
Release : 1862
Category : Fertilization of plants
ISBN : OCLC:12889312
Author : Paul H Barrett
Publisher : Routledge
Page : 237 pages
File Size : 50,5 Mb
Release : 2016-06-03
Category : History
ISBN : 9781315476964
The seventeenth volume in a 29-volume set which contain all Charles Darwin's published works. Darwin was one of the most influential figures of the 19th century. His work remains a central subject of study in the history of ideas, the history of science, zoology, botany, geology and evolution.
Author : Charles Darwin
Publisher : Unknown
Page : 390 pages
File Size : 40,8 Mb
Release : 1862
Category : Fertilization of plants
ISBN : BL:A0022129012
First edition of Darwin's primary work on plant fertilization. Detailing the relationship between the sexual structure of orchids and the insects that fertilize them, this was the first of three volumes that followed the publication of the Origin which contained supporting evidence for the author's theory of natural selection. Darwin concludes that plants are equal to animals in the marvels of their adaptation; for example, he observes that wind-pollinated flowers have no colours; it is only those insect-pollinated varieties that have bright coloured petals and sweet smelling nectars.
Author : CHARLES. DARWIN
Publisher : Unknown
Page : 0 pages
File Size : 48,6 Mb
Release : 2018
Category : Electronic
ISBN : 1033302198
Author : Charles Darwin
Publisher : Theclassics.Us
Page : 68 pages
File Size : 50,5 Mb
Release : 2013-09
Category : Electronic
ISBN : 1230370811
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1862 edition. Excerpt: ... ably run into the same ovarian group: thus the vessels supplying the upper sepal, the Fig. xxxii. Upper or posterior sepal. Labellum. Section Of The Flower Of An Orchid. The little circles show the position of the spiral vessels S S. Stigmas; Sr, stigma modified into the rostellum. Ai. Fertile anther of the outer whorl; A 2 A3, anthers of the same whorl comhined with the lower petal, forming the labellum. ai 02. Kudimentary anthers of the inner whorl (fertile in Cypripedium), generally forming the clinandrum; 03, third anther of the same whorl, when present, forming the front of the column. fertile anther (A 1), and the upper pistil or stigma (i. e. rostellum S r), all unite and form the posterior ovarian group. Again, the vessels supplying one of the lower sepals, the corner of the labellum, and one of the two stigmas (S), unite and form the antero-lateral group; and so with all the other vessels. Hence, if the existence of groups of spiral vessels can be trusted, and Dr. Hooker informs me that he has never known them to speak falsely, the flower of an Orchid certainly consists of fifteen organs, in a much modified and confluent condition. "We see three stigmas, with the two lower ones generally confluent, and with the upper one modified into the rostellum. We see six stamens, arranged in two whorls, with one alone (A 1) generally fertile. In Cypripedium, however, two stamens of the inner whorl (a 1 and a 2) are fertile, and in other Orchids these two are represented in various ways more plainly than the remaining stamens. The third stamen of the inner whorl (o 3), when its vessels can be traced, forms the front of the column: Brown thought that it often formed a medial excrescence, or ridge, cohering to the labellum; or, in the case of...
Author : Charles Darwin,Paul H. Barrett
Publisher : Routledge
Page : 214 pages
File Size : 40,7 Mb
Release : 1988
Category : Science
ISBN : 1851963073
The seventeenth volume in a 29-volume set which contain all Charles Darwin's published works. Darwin was one of the most influential figures of the 19th century. His work remains a central subject of study in the history of ideas, the history of science, zoology, botany, geology and evolution.
Author : Charles Darwin
Publisher : Unknown
Page : 328 pages
File Size : 47,5 Mb
Release : 1904
Category : Fertilisation of plants
ISBN : STANFORD:36105004510843
Author : Darwin Charles
Publisher : Unknown
Page : 352 pages
File Size : 42,5 Mb
Release : 2018-12-12
Category : Electronic
ISBN : 3337707912
Author : Charles Darwin
Publisher : Forgotten Books
Page : 0 pages
File Size : 51,5 Mb
Release : 2017-10-14
Category : Electronic
ISBN : 0266324940
Excerpt from The Various Contrivances by Which Orchids Are Fertilised by Insects Orchids properly have three pistils or female organs, united together, the upper and anterior surfaces of two of which form the two stigmas. But the two are often completely confluent, so as to appear as one. The stigma is penetrated in the act of fertilisation by long tubes, emitted by the pollen-grains, which carry the contents of the grains down to the ovules or young seeds in the ovarium. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
