The Doctrine of Descent and Darwinism

adaptation Agassiz already Ammonites Amphibians animal world Annelids apes appearance Articulata Ascidians atoms birds body bone carboniferous causes character characteristics comparative anatomy complete connection Cuvier Darwin definite derivation divergence doctrine of Descent Echinoderms embryo Eocene exhibit existence external facts families fauna fish Foraminifera formation fossil Ganoids gemmules genera genus geological Goethe gradually groups Haeckel heredity higher hypothesis idea individual infer intermediate forms investigation of nature lancelet language larva larvæ likewise limits Linnæus lower mammals Marsupials Medusa ment merely morphological motion mutability natural selection naturalists observation Oolite organisms origin ovum peculiar pedigree perfect period phase phenomena placenta plants polype portion possess present primordial produced races regard relations remains reproduction reptiles says sexual sexual reproduction Silurian skull so-called species sponges strata structure systematic terrestrial animals theory tion transformation true varieties various vertebral column Vertebrata vertebrate animals whole