The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 281
... appearing in any formation , the probability is that it only then first immigrated into that area . It is well known , for instance , that several species appear somewhat earlier in the palæozoic beds of North America than in those of ...
... appearing in any formation , the probability is that it only then first immigrated into that area . It is well known , for instance , that several species appear somewhat earlier in the palæozoic beds of North America than in those of ...
Стр. 399
... appear under the simple nauplius - form , and after passing through two or more zoea - stages , and then through the mysis - stage , finally acquire their mature structure : now in the whole great mala- costracan order , to which these ...
... appear under the simple nauplius - form , and after passing through two or more zoea - stages , and then through the mysis - stage , finally acquire their mature structure : now in the whole great mala- costracan order , to which these ...
Стр. 400
... appears in the parent , it tends to reappear at a corre- sponding age in the offspring . Certain variations can only appear at corresponding ages ; for instance , peculiarities in the caterpillar , cocoon , or imago states of the silk ...
... appears in the parent , it tends to reappear at a corre- sponding age in the offspring . Certain variations can only appear at corresponding ages ; for instance , peculiarities in the caterpillar , cocoon , or imago states of the silk ...
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adapted admit affinity ancient animals appear Archipelago areas become believe belonging birds Cambrian characters classification climate closely allied species common continent creation crustaceans degree deposits descent with modification developed difficulty distant distinct species domestic doubt embryo Europe existing extinct facts faunas fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important INDIANENSIS individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammæ mammals manner marine Marsupials MDCCCXX migration modified descendants mongrels mountains natural selection naturalists nearly oceanic islands offspring parent peculiar perfect pistil plants pollen present probably produced progenitor quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds SIGILLUM Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory of natural tion variations varieties VERITAS whole widely different