The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life and The Descent of Man and Selection in Relation to SexModern library, 1936 - 1000 páginas |
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Página 42
... forms , as local forms , as geographi- cal races or sub - species , and as true representative species . The first or variable forms vary much within the limits of the same island . The local forms are moderately constant and distinct ...
... forms , as local forms , as geographi- cal races or sub - species , and as true representative species . The first or variable forms vary much within the limits of the same island . The local forms are moderately constant and distinct ...
Página 297
... forms . So again in the mountainous island of Fernando Po , in the Gulf of Guinea , Mr. Mann found temperate European forms beginning to appear at the height of about five thousand feet . On the mountains of Panama , at the height of ...
... forms . So again in the mountainous island of Fernando Po , in the Gulf of Guinea , Mr. Mann found temperate European forms beginning to appear at the height of about five thousand feet . On the mountains of Panama , at the height of ...
Página 364
... forms are supplanted by new and improved forms . Neither single species nor groups of species reappear when the chain of ordinary generation is once broken . The gradual diffu- sion of dominant forms , with the slow modification of ...
... forms are supplanted by new and improved forms . Neither single species nor groups of species reappear when the chain of ordinary generation is once broken . The gradual diffu- sion of dominant forms , with the slow modification of ...
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Términos y frases comunes
acquired adult allied apes appear beak beautiful become believe birds breeds cause characters civilised closely colour common confined crossed crustaceans degree descended developed distinct species domestic doubt eggs existing extinct extremely fact favourable feathers female fertility fishes formation forms Fritz Müller genera genus given gradations greater number groups habits Hence hybrids important individuals inhabitants inherited insects instance instincts intermediate islands kind larvæ latter Lepidoptera less likewise living lower animals Malay Archipelago males mammæ mammals manner Marsupials modified monkeys natural selection naturalists nearly nest observed ocelli offspring organs Origin of Species ornaments perfect period pigeons plumage pollen present probably produced progenitor quadrupeds races Red Grouse relation remarks resemble rudimentary seeds sexes sexual selection shew shewn slight South America sterility stridulating structure supposed tail tion variability variations varieties various vary whilst whole widely wings young