Contributions to the Theory of Natural Selection: A Series of Essays |
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Page 6
It is evidently possible that two or three distinct species may have had a common
antitype , and that each of these may again have become the antitypes from
which other closely allied species were created . The effect of this would be , that
so ...
It is evidently possible that two or three distinct species may have had a common
antitype , and that each of these may again have become the antitypes from
which other closely allied species were created . The effect of this would be , that
so ...
Page 7
There constantly occur two or more modifications of an organ or modifications of
two distinct organs , leading us on to two distinct series of species , which at
length differ so much from each other as to form distinct genera or families .
There constantly occur two or more modifications of an organ or modifications of
two distinct organs , leading us on to two distinct series of species , which at
length differ so much from each other as to form distinct genera or families .
Page 26
... and this instability is considered to be a distinctive peculiarity of all varieties ,
even of those occurring among wild animals in a state of nature , and to constitute
a provision for preserving unchanged the originally created distinct species .
... and this instability is considered to be a distinctive peculiarity of all varieties ,
even of those occurring among wild animals in a state of nature , and to constitute
a provision for preserving unchanged the originally created distinct species .
Page 54
In every part of the tropics there are tree - snakes that twist among boughs and
shrubs , or lie coiled up on the dense masses of foliage . These are of many
distinct groups , and comprise both venomous and harmless genera ; but almost
all of ...
In every part of the tropics there are tree - snakes that twist among boughs and
shrubs , or lie coiled up on the dense masses of foliage . These are of many
distinct groups , and comprise both venomous and harmless genera ; but almost
all of ...
Page 57
concentricus ) is found only at Pará , on a distinct species of tree , the bark of
which it resembles with equal accuracy . Both these insects are abundant , and
we may fairly conclude that the protection they derive from this strange
concealment ...
concentricus ) is found only at Pará , on a distinct species of tree , the bark of
which it resembles with equal accuracy . Both these insects are abundant , and
we may fairly conclude that the protection they derive from this strange
concealment ...
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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 |