The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCollier Books, 1962 - 512 páginas |
Dentro del libro
Resultados 1-3 de 90
Página 61
... distinct forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian Crustaceans : thus , the male of the Tanais regularly occurs under two distinct ...
... distinct forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian Crustaceans : thus , the male of the Tanais regularly occurs under two distinct ...
Página 126
... distinct of the original eleven species . The new species , moreover , will be allied to each other in a widely different manner . Of the eight descend- ants from ( A ) the three marked a11 , q1a , p14 , will be nearly related from ...
... distinct of the original eleven species . The new species , moreover , will be allied to each other in a widely different manner . Of the eight descend- ants from ( A ) the three marked a11 , q1a , p14 , will be nearly related from ...
Página 366
... distinct , with extremely few shells , crustacea , or echinodermata in common ; but Dr. Günther has recently shown that about thirty per cent . of the fishes are the same on the opposite sides of the isthmus of Panama ; and this fact ...
... distinct , with extremely few shells , crustacea , or echinodermata in common ; but Dr. Günther has recently shown that about thirty per cent . of the fishes are the same on the opposite sides of the isthmus of Panama ; and this fact ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
Otras 13 secciones no mostradas
Otras ediciones - Ver todas
Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear 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 eggs embryo existing extinct extremely facts favourable fertilised 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 Marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil 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 tend theory tion variability variations varieties vary whilst whole wings young