The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, Volumes 1-2D. Appleton, 1917 - Evolution |
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Page 70
... genus have been formed , the species of that genus present a number of varieties , that is of incipient species , beyond the average . It is not that all large genera are now varying much , and are thus increasing in the number of their ...
... genus have been formed , the species of that genus present a number of varieties , that is of incipient species , beyond the average . It is not that all large genera are now varying much , and are thus increasing in the number of their ...
Page 203
... genus ; and that each has been created . with a strong tendency , when crossed with species in- habiting distant quarters of the world , to produce hy- brids resembling in their stripes , not their own parents , but other species of the ...
... genus ; and that each has been created . with a strong tendency , when crossed with species in- habiting distant quarters of the world , to produce hy- brids resembling in their stripes , not their own parents , but other species of the ...
Page 209
... genus , but the genus gives the characters ; for this seems founded on the appreciation of many trifling points of resemblance , too slight to be defined . Certain plants , belonging to the Malpighiaceæ , bear perfect and degraded ...
... genus , but the genus gives the characters ; for this seems founded on the appreciation of many trifling points of resemblance , too slight to be defined . Certain plants , belonging to the Malpighiaceæ , bear perfect and degraded ...
Contents
VARIATION UNDER DOMESTICATION | 7 |
CHAPTER II | 51 |
STRUGGLE FOR EXISTENCE | 66 |
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Common terms and phrases
adapted affinity allied species ancient animals appear Archipelago beak become believe belonging birds breeds Cambrian cause characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo Europe existing extinct extremely facts favourable fertilised fertility fish flowers formation formerly forms fossil Fritz Müller Gärtner genera genus geological geological period Glacial period gradations groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly occur oceanic islands offspring organisation parent peculiar perfect pigeon pistil plants pollen present probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance seeds Silurian slight South America stage stamens sterility structure successive suppose theory tion variability variations varieties vary whilst whole widely different wings