The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
Результаты поиска по книге
Результаты 1 – 5 из 30
Стр. 35
... genera , and tufts of species , which latter ramify into sub - species and varieties . With this representation of the tree - like distribution of the system , we shall gladly revert to the comparison of the members of different types ...
... genera , and tufts of species , which latter ramify into sub - species and varieties . With this representation of the tree - like distribution of the system , we shall gladly revert to the comparison of the members of different types ...
Стр. 42
... genera of coral depends merely on minor modifications of this mode of reproduction . Yet single corals exist in which , on careful comparison , not only may accidental deviations be already discerned , but regularly recurring variations ...
... genera of coral depends merely on minor modifications of this mode of reproduction . Yet single corals exist in which , on careful comparison , not only may accidental deviations be already discerned , but regularly recurring variations ...
Стр. 46
... genera- tion arise cell - spheres , or germs , which develope into the second generation - the Cercaria . Great excitement was likewise aroused by the dis- covery of the germ - formation of the larvæ of 46 THE DOCTRINE OF DESCENT .
... genera- tion arise cell - spheres , or germs , which develope into the second generation - the Cercaria . Great excitement was likewise aroused by the dis- covery of the germ - formation of the larvæ of 46 THE DOCTRINE OF DESCENT .
Стр. 57
... genera , which , by all systematic rules , and by their geological position , occupy a lower rank in the series of echino- derms . The crabs , or anourous crustacca , are raised by sundry characteristics above their long - tailed ...
... genera , which , by all systematic rules , and by their geological position , occupy a lower rank in the series of echino- derms . The crabs , or anourous crustacca , are raised by sundry characteristics above their long - tailed ...
Стр. 77
... genera and species distinguished from one another by mere shades , so that of two allied genera it is often difficult , nay , impossible , to state which TRANSFORMATIONS OF THE ECHINE . 77.
... genera and species distinguished from one another by mere shades , so that of two allied genera it is often difficult , nay , impossible , to state which TRANSFORMATIONS OF THE ECHINE . 77.
Другие издания - Просмотреть все
Часто встречающиеся слова и выражения
according adaptation already Ammonites Amphibians animal world apes appearance Ascidian become birds brain carboniferous causes Cetacea character characteristics comparative anatomy complete connection continent Darwin dentition derivation diverge doctrine of Descent Echinoderms embryonic Eocene exhibit existence external facts families fauna fish formation fossil Ganoids Gastrula genera genus geological Goethe grade gradually groups Haeckel heredity higher horse human hypothesis idea individual infer Insectivora intermediate forms islands lancelet language larva larvæ likewise linguistic lower mammals Marsupials Medusa ment merely metamorphosis modifications morphological mutability natural selection observation Oolite organisms origin peculiar pedigree perfect period phase phenomena placenta plants polypes possess present primordial progenitors races relations remains reproduction reptiles resemblance Rütimeyer says scarcely scientific separate sexual Silurian skull species strata structure systematic terrestrial animals Tertiary theory of selection tion transformation transition true Ungulata Ungulates varieties vertebral column Vertebrata vertebrate animals whole
Популярные отрывки
Стр. 162 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.18 Darwin always knew that his views would be controversial. A few days before The Origin of Species appeared, Darwin wrote, in a letter to Wallace, 'God knows what...
Стр. 160 - Na'geli on plants, and the remarks by various authors with respect to animals, more especially those recently made by Professor Broca, that in the earlier editions of my Origin of Species I perhaps attributed too much to the action of natural selection or the survival of the fittest.