The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356페이지 |
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61 페이지
... Paleozoic strata ( not including igneous beds ) . Secondary strata .... Tertiary strata .. Feet 57,154 • 13,190 2,240 -making altogether 72,584 feet ; that is , very nearly thirteen and three - quarters British miles . Some of the ...
... Paleozoic strata ( not including igneous beds ) . Secondary strata .... Tertiary strata .. Feet 57,154 • 13,190 2,240 -making altogether 72,584 feet ; that is , very nearly thirteen and three - quarters British miles . Some of the ...
65 페이지
... Paleozoic periods , it is super- fluous to state that our evidence is fragmentary in an extreme degree . For instance , until recently not a land- shell was known belonging to either of these vast peri- ods , with the exception of one ...
... Paleozoic periods , it is super- fluous to state that our evidence is fragmentary in an extreme degree . For instance , until recently not a land- shell was known belonging to either of these vast peri- ods , with the exception of one ...
71 페이지
... Paleozoic formations . In many regions the metamorphic and granitic rocks would be found much more widely extended than they appear to be , if all the sedimentary beds were removed which rest unconformably on them , and which could not ...
... Paleozoic formations . In many regions the metamorphic and granitic rocks would be found much more widely extended than they appear to be , if all the sedimentary beds were removed which rest unconformably on them , and which could not ...
73 페이지
... paleozoic beds of North America than in those of Europe ; time having apparently been required for their migration from the American to the European seas . In examining the latest deposits in various quar- ters of the world , it has ...
... paleozoic beds of North America than in those of Europe ; time having apparently been required for their migration from the American to the European seas . In examining the latest deposits in various quar- ters of the world , it has ...
91 페이지
... paleozoic series to the present time . We are thus carried back to a period so remote that the appearance of the so - called Primordial fauna ( of Bar- rande ) may by some be considered as a comparatively modern event . " The Eozoon ...
... paleozoic series to the present time . We are thus carried back to a period so remote that the appearance of the so - called Primordial fauna ( of Bar- rande ) may by some be considered as a comparatively modern event . " The Eozoon ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young