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 371
... latter point will become a far more essential consideration than it is at present ; for differences , however slight , between any two forms if not blended by intermediate gradations , are looked at by most naturalists as sufficient to ...
... latter point will become a far more essential consideration than it is at present ; for differences , however slight , between any two forms if not blended by intermediate gradations , are looked at by most naturalists as sufficient to ...
Página 771
... latter form of inheritance into sexually - limited transmission . All that he could do would be to persevere in selecting every male pigeon which was in the least degree of a paler blue ; and the natural result of this process , if ...
... latter form of inheritance into sexually - limited transmission . All that he could do would be to persevere in selecting every male pigeon which was in the least degree of a paler blue ; and the natural result of this process , if ...
Página 897
... latter are of more value to the tribe , as they will , when grown up , aid in defending it , and can support themselves . But the trouble experienced by the women in rearing children , their consequent loss of beauty , the higher ...
... latter are of more value to the tribe , as they will , when grown up , aid in defending it , and can support themselves . But the trouble experienced by the women in rearing children , their consequent loss of beauty , the higher ...
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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