Contributions to the Theory of Natural Selection: A Series of Essays |
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Page 24
We still see remaining an antitypal sketch of a wing adapted for flight in the scaly
flapper of the penguin , and limbs first concealed beneath the skin , and then
weakly protruding from it , were the necessary gradations before others should
be ...
We still see remaining an antitypal sketch of a wing adapted for flight in the scaly
flapper of the penguin , and limbs first concealed beneath the skin , and then
weakly protruding from it , were the necessary gradations before others should
be ...
Page 31
Either their food is more liable to failure , or they have not sufficient power of wing
to search for it over an extensive area , or during some season of the year it
becomes very scarce , and less wholesome substitutes have to be found ; and
thus ...
Either their food is more liable to failure , or they have not sufficient power of wing
to search for it over an extensive area , or during some season of the year it
becomes very scarce , and less wholesome substitutes have to be found ; and
thus ...
Page 35
An antelope with shorter or weaker legs must necessarily suffer more from the
attacks of the feline carnivora ; the passenger pigeon with less powerful wings
would sooner or later be affected in its powers of procuring a regular supply of
food ...
An antelope with shorter or weaker legs must necessarily suffer more from the
attacks of the feline carnivora ; the passenger pigeon with less powerful wings
would sooner or later be affected in its powers of procuring a regular supply of
food ...
Page 42
We have also here an acting cause to account for that balance so often observed
in nature , - a deficiency in one set of organs always being compensated by an
increased development of some others - powerful wings accompanying weak
feet ...
We have also here an acting cause to account for that balance so often observed
in nature , - a deficiency in one set of organs always being compensated by an
increased development of some others - powerful wings accompanying weak
feet ...
Page 48
Exactly the same thing has occurred with pigeons ; and in the case of rats and
mice , the white variety has not been shown to be at all dependent on alteration
of climate , food , or other external conditions . In many cases the wings of an
insect ...
Exactly the same thing has occurred with pigeons ; and in the case of rats and
mice , the white variety has not been shown to be at all dependent on alteration
of climate , food , or other external conditions . In many cases the wings of an
insect ...
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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 |