The Doctrine of Descent and Darwinism

according adaptation already Ammonites Amphibians animal world apes appearance Ascidians birds bone brain causes Cetacea character characteristics comparative anatomy complete connection continent Darwin definite dentition derivation divergent division doctrine of Descent Echinoderms embryonic Eocene exhibit existence external extremely facts families fauna favour fish formation fossil gemmules genera genus geological Goethe grade gradually groups Haeckel heredity higher horse hypothesis idea individual infer intermediate forms islands lancelet language larva larvæ likewise linguistic lower mammals Marsupials Medusa ment merely metamorphosis modifications morphological natural selection naturalist observation Oolite organisms origin Origin of Species ovum peculiar pedigree perfect period phase phenomena placenta plants polypes possess present primordial progenitors races regard relations remains reproduction reptiles resemblance Rütimeyer says scarcely separate sexual skull species strata structure systematic terrestrial animals theory of selection tion transformation Ungulata varieties vegetal vertebral column Vertebrata vertebrate animals whole