Contributions to the Theory of Natural Selection: A Series of EssaysMacmillan, 1871 - 384 من الصفحات Wallace noticed on expeditions to the Amazon and the Malay archipelego that mammals in Southeast Asia are more advanced than their Australian cousins. His suggestion was that the two continents had split before the better adapted mammals had evolved in Asia. The isolated Australian marsupials were able to thrive, whilst those in Asia were driven to extinction by competition from more advanced mammals. This led to his theory of natural selection, which he presented to the Linnean Society in 1858 with Charles Darwin. This volume reprints those papers presented to the Linnean Society. |
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الصفحة 111
... sexes varies much in different classes of animals . In the higher vertebrates , where the number of young produced at a birth is small and the same individuals breed many years in succession , the preservation of both sexes is almost ...
... sexes varies much in different classes of animals . In the higher vertebrates , where the number of young produced at a birth is small and the same individuals breed many years in succession , the preservation of both sexes is almost ...
الصفحة 112
... sexes ; and we should , there- fore , expect to find that in some cases the special pro- tection given to the female was in the male less in amount or altogether wanting . The facts entirely con- firm this expectation . In the spectre ...
... sexes ; and we should , there- fore , expect to find that in some cases the special pro- tection given to the female was in the male less in amount or altogether wanting . The facts entirely con- firm this expectation . In the spectre ...
الصفحة 113
... sexes , which fly in similar localities ; so that the influence of " external conditions " cannot be invoked here as ... sex . And that it is chiefly due to this cause rather than to what Mr. Darwin terms " sexual selection appears to be ...
... sexes , which fly in similar localities ; so that the influence of " external conditions " cannot be invoked here as ... sex . And that it is chiefly due to this cause rather than to what Mr. Darwin terms " sexual selection appears to be ...
الصفحة 114
... sexes equally well coloured . The Carabidæ , the Coc- cinellida , Chrysomelida , and the Telephori have both sexes equally conspicuous , and seldom differing in colours . The brilliant Curculios , which are protected by their hardness ...
... sexes equally well coloured . The Carabidæ , the Coc- cinellida , Chrysomelida , and the Telephori have both sexes equally conspicuous , and seldom differing in colours . The brilliant Curculios , which are protected by their hardness ...
الصفحة 115
... sexes of this bird are alike in colouration , but in summer the female is much the most conspicuous , having a black ... sexes in both winter and summer plumage , and remarks on the strange peculiarity of the usual colours of the two ...
... sexes of this bird are alike in colouration , but in summer the female is much the most conspicuous , having a black ... sexes in both winter and summer plumage , and remarks on the strange peculiarity of the usual colours of the two ...
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abundant adapted Amboyna anal valves animals antennæ appear beautiful become bees beetles believe birds Borneo brain build butterflies caterpillars causes Celebes changes character colour concealed conspicuous Crown 8vo curious Danaidæ Darwin Diphilus direction distinct Edition eggs essay exactly existence external extinct Extra fcap facts faculties favourable Fcap flowers genera genus geological groups habits Heliconidæ imitation India individuals inhabiting insects instinct islands Java larvæ Lepidoptera less Malayan male materials mental mimic mimicry mode modified Moluccas moths natural selection nectary nest never observations occur organic Origin of Species Ormenus Pammon Papilio Papilio Ulysses Papilionidæ peculiar perfect phenomena POEMS Polydorus possess present probably produced Professor protection races reason regions remarkable render resemble savage sexes sexual sexual selection shown structure Sumatra tail theory of natural Theseus tints tion trees tropical variation varied varieties whole wings young birds
مقاطع مشهورة
الصفحة 19 - Morte d'Arthur.— SIR THOMAS MALORY'S BOOK OF KING ARTHUR AND OF HIS NOBLE KNIGHTS OF THE ROUND TABLE. The original Edition of CAXTON, revised for Modern Use. With an Introduction by Sir EDWARD STRACHEY, Bart. pp. xxxvii., 509. "It is with perfect confidence that we recommend this edition of the old romance to every class of readers.
الصفحة 339 - ... the passage from the current to the needle, if not demonstrable, is thinkable, and that we entertain no doubt as to the final mechanical solution of the problem. But the passage from the physics of the brain to the corresponding facts of consciousness is unthinkable. Granted that a definite thought, and a definite molecular action in the brain occur simultaneously ; we do not possess the intellectual organ, nor apparently any rudiment of the organ, which would enable us to pass, by a process...
الصفحة 18 - The Globe Editions are admirable for their scholarly editing, their typographical excellence, their compendious form, and their cheapness.
الصفحة 23 - THE FAIRY BOOK ; the Best Popular Fairy Stories. Selected and rendered anew by the Author of
الصفحة 23 - BACON'S ESSAYS AND COLOURS OF GOOD AND EVIL. With Notes and Glossarial Index. By W. ALDIS WRIGHT, MA THE PILGRIM'S PROGRESS from this World to that which is to come.
الصفحة 22 - Messrs. Macmillan have, in their Golden Treasury Series, especially provided editions of standard works, volumes of selected poetry, and original compositions, which entitle this series to be called classical. Nothing can be better than the literary execution, nothing more elegant than the material workmanship"—BRITISH QUARTERLY REVIEW. The Golden Treasury of the Best Songs and LYRICAL POEMS IN THE ENGLISH LANGUAGE.
الصفحة 18 - The Globe Editions are admirable for their scholarly editing, their typographical excellence, their compendious form, and their cheapness.
الصفحة 6 - Garnett. — IDYLLS AND EPIGRAMS. Chiefly from the Greek Anthology. By RICHARD GARNETT. Fcap. 8vo. 2s. 6d. "A charming little book. For English readers, Mr. Garnetfs translalations will open a new world of thought
الصفحة 372 - Freeman — HISTORY OF FEDERAL GOVERNMENT, from the Foundation of the Achaian League to the Disruption of the United States.
الصفحة 22 - THE GOLDEN TREASURY OF THE BEST SONGS AND LYRICAL POEMS IN THE ENGLISH LANGUAGE. Selected and arranged, with Notes, by FRANCIS TURNER PALGRAVE.