The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432 páginas |
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Página 82
... apply with equal force to the earliest known species . For in- stance , it cannot be doubted that all the Cambrian and Silurian trilobites are descended from some one crusta- cean , 82 [ CHAP . X. GROUPS OF ALLIED SPECIES.
... apply with equal force to the earliest known species . For in- stance , it cannot be doubted that all the Cambrian and Silurian trilobites are descended from some one crusta- cean , 82 [ CHAP . X. GROUPS OF ALLIED SPECIES.
Página 83
... Cambrian stratum was deposited long periods elapsed , as long as , or probably far longer than , the whole interval from the Cambrian age to the present day ; and that during these vast periods the world swarmed with living creatures ...
... Cambrian stratum was deposited long periods elapsed , as long as , or probably far longer than , the whole interval from the Cambrian age to the present day ; and that during these vast periods the world swarmed with living creatures ...
Página 84
... Cambrian system , I can give no satisfactory answer . Several eminent geologists , with Sir R. Mur- chison at their head , were until recently convinced that we beheld in the organic remains of the lowest Silurian stratum the first dawn ...
... Cambrian system , I can give no satisfactory answer . Several eminent geologists , with Sir R. Mur- chison at their head , were until recently convinced that we beheld in the organic remains of the lowest Silurian stratum the first dawn ...
Página 85
... Cambrian period , and which are almost the same with those since used by Sir W. Logan , have proved true . Nevertheless , the diffi- culty of assigning any good reason for the absence of vast piles of strata rich in fossils beneath the ...
... Cambrian period , and which are almost the same with those since used by Sir W. Logan , have proved true . Nevertheless , the diffi- culty of assigning any good reason for the absence of vast piles of strata rich in fossils beneath the ...
Página 87
... Cambrian period . The col- . pured map appended to my volume on Coral Reefs , led me to conclude that the great oceans are still mainly areas of subsidence , the great archipelagoes still areas of Oscillations of level , and the ...
... Cambrian period . The col- . pured map appended to my volume on Coral Reefs , led me to conclude that the great oceans are still mainly areas of subsidence , the great archipelagoes still areas of Oscillations of level , and the ...
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Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised 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 individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings