The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página vii
... different organs in members of the same class , de- veloped from one and the same source - Reasons for disbeliev- ing in great and abrupt modifications . 262 CHAPTER VIII . INSTINCT . Instincts comparable with habits , CONTENTS . vii.
... different organs in members of the same class , de- veloped from one and the same source - Reasons for disbeliev- ing in great and abrupt modifications . 262 CHAPTER VIII . INSTINCT . Instincts comparable with habits , CONTENTS . vii.
Página viii
... INSTINCT . Instincts comparable with habits , but different in their origin- Instincts graduated — Aphides and ants — Instincts variable— Domestic instincts , their origin - Natural instincts of the cuckoo , Molothrus , ostrich , and ...
... INSTINCT . Instincts comparable with habits , but different in their origin- Instincts graduated — Aphides and ants — Instincts variable— Domestic instincts , their origin - Natural instincts of the cuckoo , Molothrus , ostrich , and ...
Página 10
... instincts . Many cultivated plants display the utmost vigour , and yet rarely or never seed ! In some few cases it has been discovered that a very trifling change , such as a little more or less water at some particular period of growth ...
... instincts . Many cultivated plants display the utmost vigour , and yet rarely or never seed ! In some few cases it has been discovered that a very trifling change , such as a little more or less water at some particular period of growth ...
Página 208
... instincts be acquired and modified through natural selection ? What shall we say to the instinct which leads the bee to make cells , and which has practically anticipated the discoveries of profound mathematicians ? Fourthly , how can ...
... instincts be acquired and modified through natural selection ? What shall we say to the instinct which leads the bee to make cells , and which has practically anticipated the discoveries of profound mathematicians ? Fourthly , how can ...
Página 256
... instinctive hatred of the queen - bee , which urges her to destroy the young queens , her daughters , as soon as they are born , or to perish herself in the combat ; for un- doubtedly this is for the good of the community ; and maternal ...
... instinctive hatred of the queen - bee , which urges her to destroy the young queens , her daughters , as soon as they are born , or to perish herself in the combat ; for un- doubtedly this is for the good of the community ; and maternal ...
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Términos y frases comunes
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period 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 males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young