The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volumen1D. Appleton, 1898 |
Dentro del libro
Resultados 1-5 de 41
Página 3
... Never- theless , such a conclusion , even if well founded , would be unsatisfactory , until it could be shown how the innumerable species inhabiting this world have been modified , so as to acquire that perfection of structure and ...
... Never- theless , such a conclusion , even if well founded , would be unsatisfactory , until it could be shown how the innumerable species inhabiting this world have been modified , so as to acquire that perfection of structure and ...
Página 10
... 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 , will determine whether or not a plant will produce seeds . I cannot here give ...
... 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 , will determine whether or not a plant will produce seeds . I cannot here give ...
Página 29
... never heard of an instance in England ; and the mongrels were black , brown , and mottled . I also crossed a barb with a spot , which is a white bird with a red tail and red spot on the forehead , and which notoriously breeds very true ...
... never heard of an instance in England ; and the mongrels were black , brown , and mottled . I also crossed a barb with a spot , which is a white bird with a red tail and red spot on the forehead , and which notoriously breeds very true ...
Página 32
... never less than 20,000 pigeons were taken with the court . " The monarchs of Iran and Turan sent him some very rare birds ; " and continues the courtly his- torian , " His Majesty by crossing the breeds , which method was never ...
... never less than 20,000 pigeons were taken with the court . " The monarchs of Iran and Turan sent him some very rare birds ; " and continues the courtly his- torian , " His Majesty by crossing the breeds , which method was never ...
Página 33
... never met a pigeon , or poultry , or duck , or rabbit fancier , who was not fully convinced that each main breed was descended from a distinct species . Van Mons , in his treatise on pears and apples , shows how utterly he disbelieves ...
... never met a pigeon , or poultry , or duck , or rabbit fancier , who was not fully convinced that each main breed was descended from a distinct species . Van Mons , in his treatise on pears and apples , shows how utterly he disbelieves ...
Otras ediciones - Ver todas
Términos y frases comunes
adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young