The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 páginas |
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Página 29
... remarkable . Independently of the generative organs , consisting of manifold parts of greater or less importance , the history of the multiplication and development of the bee de- mands a study of itself . The function , and therewith ...
... remarkable . Independently of the generative organs , consisting of manifold parts of greater or less importance , the history of the multiplication and development of the bee de- mands a study of itself . The function , and therewith ...
Página 45
... remarkable movements of pro- toplasm . The germ - cells of different classes of animals vary considerably in their microscopic dimensions ; nevertheless , in the whole animal kingdom , from the sponges and polypes up to the mammals ...
... remarkable movements of pro- toplasm . The germ - cells of different classes of animals vary considerably in their microscopic dimensions ; nevertheless , in the whole animal kingdom , from the sponges and polypes up to the mammals ...
Página 75
... remarkable variation of the Sauroid type , the winged lizard or Pterodactyl . It is evident from their well - preserved skeletons that the wing membrane was stretched , as in the bat , between the posterior and anterior extremities ...
... remarkable variation of the Sauroid type , the winged lizard or Pterodactyl . It is evident from their well - preserved skeletons that the wing membrane was stretched , as in the bat , between the posterior and anterior extremities ...
Página 76
... the older fossiliferous strata both divisions are abundantly repre- * Bulletin de la Société des Sciences Naturelles de Neufchâtel , IX . 2 . sented . A highly remarkable and important interme- diate form 76 THE DOCTRINE OF DESCENT .
... the older fossiliferous strata both divisions are abundantly repre- * Bulletin de la Société des Sciences Naturelles de Neufchâtel , IX . 2 . sented . A highly remarkable and important interme- diate form 76 THE DOCTRINE OF DESCENT .
Página 77
Dr. Schmidt (Eduard Oskar). sented . A highly remarkable and important interme- diate form is also known , found in the upper Silurian strata of Dudley ( Eucladia Johnsoni ) , the more impor- tant as but few transitional forms between ...
Dr. Schmidt (Eduard Oskar). sented . A highly remarkable and important interme- diate form is also known , found in the upper Silurian strata of Dudley ( Eucladia Johnsoni ) , the more impor- tant as but few transitional forms between ...
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according adaptation already Ammonites Amphibians animal world apes appearance Ascidian birds body bone brain causes Cetacea character characteristics comparative anatomy complete connection continent Darwin dentition derivation diverge doctrine of Descent Echinoderms embryo Eocene exhibit existence external facts families fauna fish formation fossil Gastrula gemmules genera genus geological Goethe grade gradually groups Haeckel heredity higher horse human hypothesis idea individual infer intermediate forms investigation islands lancelet language larva larvæ likewise linguistic lower mammals Marsupials Medusa ment merely metamorphosis modifications morphological mutability natural selection observations Oolite organisms origin ovum peculiar pedigree perfect period phase phenomena placenta plants polypes possess present primordial progenitors races regard relations remains reproduction reptiles Rütimeyer says scarcely scientific separate sexual Silurian skull species strata structure systematic terrestrial animals theory of selection tion transformation true Ungulata Ungulates varieties vertebral column Vertebrata vertebrate animals whole