Author: Charles DarwinPublisher:
ISBN:
Category : Fertilization of plants
Languages : en
Pages : 336
Book Description
The Various Contrivances by which Orchids are Fertilised by Insects
Author: Charles DarwinPublisher:
ISBN:
Category : Fertilization of plants
Languages : en
Pages : 336
Book Description
On the Various Contrivances by which British and Foreign Orchids are Fertilised by Insects and on the Good Effects of Intercrossing ...
Author: Charles DarwinPublisher:
ISBN:
Category : Fertilization of plants
Languages : en
Pages : 416
Book Description
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.
On the Various Contrivances by Which British and Foreign Orchids Are Fertilised by Insects, and the Good Effects of Intercrossing
Author: Charles DarwinPublisher:
ISBN: 9781904078098
Category :
Languages : en
Pages : 372
Book Description
This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book. ++++ The below data was compiled from various identification fields in the bibliographic record of this title. This data is provided as an additional tool in helping to ensure edition identification: ++++ On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects: And On The Good Effects Of Intercrossing Charles Darwin J. Murray, 1862 Fertilization of plants; Orchids; Pollination by insects
On the Various Contrivances by which British and Foreign Orchids are fertilised by Insects, and on the good effects of intercrossing ... With illustrations
Author: Charles DarwinPublisher:
ISBN:
Category : Fertilization of plants
Languages : en
Pages : 390
Book Description
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.
On the Various Contrivances by Which British and Foreign Orchids Are Fertilised by Insects; and on the Good Effects of Intercrossing
Author: Charles DarwinPublisher: Theclassics.Us
ISBN: 9781230370811
Category :
Languages : en
Pages : 68
Book Description
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...
On the Various Contrivances by which British and Foreign Orchids are Fertilised by Insects, and on the Good Effects of Intercrossing ... With Illustrations.
Author: Charles DarwinOn the Various Contrivances by which British and Foreign Orchids are Fertilised by Insects
Author: Charles DarwinPublisher:
ISBN: 9783337702540
Category :
Languages : en
Pages : 380
Book Description
Darwin's Orchids
Author: Retha Edens-MeierPublisher: University of Chicago Press
ISBN: 0226044912
Category : Nature
Languages : en
Pages : 440
Book Description
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.
The Epistemic Benefits of Disagreement
Author: Kirk LougheedPublisher: Springer Nature
ISBN: 3030345033
Category : Philosophy
Languages : en
Pages : 134
Book Description
This book presents an original discussion and analysis of epistemic peer disagreement. It reviews a wide range of cases from the literature, and extends the definition of epistemic peerhood with respect to the current one, to account for the actual variability found in real-world examples. The book offers a number of arguments supporting the variability in the nature and in the range of disagreements, and outlines the main benefits of disagreement among peers i.e. what the author calls the benefits to inquiry argument.
The Effects of Cross and Self Fertilisation in the Vegetable Kingdom
Author: Charles DarwinPublisher:
ISBN:
Category : Conception
Languages : en
Pages : 504
Book Description