Contributions to the Theory of Natural Selection: A Series of Essays |
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Page 28
Large animals cannot be so abundant as small ones ; the carnivora must be less
numerous than the herbivora ; eagles and lions can never be so plentiful as
pigeons and antelopes ; and the wild asses of the Tartarian deserts cannot equal
in ...
Large animals cannot be so abundant as small ones ; the carnivora must be less
numerous than the herbivora ; eagles and lions can never be so plentiful as
pigeons and antelopes ; and the wild asses of the Tartarian deserts cannot equal
in ...
Page 30
Why is this bird so extraordinarily abundant , while others producing two or three
times as many young are much less plentiful ? The explanation is not difficult .
The food most congenial to this species , and on which it 30 ON THE TENDENCY
...
Why is this bird so extraordinarily abundant , while others producing two or three
times as many young are much less plentiful ? The explanation is not difficult .
The food most congenial to this species , and on which it 30 ON THE TENDENCY
...
Page 31
... a different climate , though , as these migrating birds are seldom excessively
abundant , it is evident that the countries they visit are still deficient in a constant
and abundant supply of wholesome INDEFINITELY FROM THE ORIGINAL TYPE
.
... a different climate , though , as these migrating birds are seldom excessively
abundant , it is evident that the countries they visit are still deficient in a constant
and abundant supply of wholesome INDEFINITELY FROM THE ORIGINAL TYPE
.
Page 32
still deficient in a constant and abundant supply of wholesome food . Those
whose organization does not permit them to migrate when their food becomes
periodically scarce , can never attain a large population . This is probably the
reasons ...
still deficient in a constant and abundant supply of wholesome food . Those
whose organization does not permit them to migrate when their food becomes
periodically scarce , can never attain a large population . This is probably the
reasons ...
Page 56
It is very abundant , but so exactly does it resemble the bark in colour and
rugosity , and so closely does it cring to the branches , that until it moves it is
absolutely invisible ! An allied species ( O . concentricus ) is found only at Pará ,
on a 56 ...
It is very abundant , but so exactly does it resemble the bark in colour and
rugosity , and so closely does it cring to the branches , that until it moves it is
absolutely invisible ! An allied species ( O . concentricus ) is found only at Pará ,
on a 56 ...
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abundant action adapted allied animals appear beautiful become believe birds body build butterflies causes Celebes changes character closely colour common comparatively complete concealment consider conspicuous continually direct distinct doubt Edition equally evidence exactly example existence explained facts female flight flowers frequently further genera genus give greater groups habits imitation important increase India individuals inhabiting insects interesting islands Java kind known less limited living male marked materials means mimicry modifications moths natural selection necessary nest never objects observations occur organic original Papilio perfect period phenomena possess present probably produced protection race reason region remarkable render resemble result savage seems seen sexes shown similar species structure supposed tail theory tints tion trees tropical true universe variation varied varieties various whole wings
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Bibliographic information
| Title | Contributions to the Theory of Natural Selection: A Series of Essays Contributions to the Theory of Natural Selection: A Series of Essays, Alfred Russel Wallace Marilee E. Thomas and Robert C. Thomas Science and Related Subjects Collection |
| Author | Alfred Russel Wallace |
| Edition | 2 |
| Publisher | Macmillan and Company, 1870 |
| Original from | Oxford University |
| Digitized | 8 mai 2006 |
| Length | 384 pages |
| Export Citation | BiBTeX EndNote RefMan |