Contributions to the Theory of Natural Selection: A Series of Essays |
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Page 17
Between the Palæozoic and Neozoic periods of Professor Forbes , there is
scarcely a species in common , and the greater part of the genera and families
also disappear to be replaced by new ones . It is almost universally admitted that
such a ...
Between the Palæozoic and Neozoic periods of Professor Forbes , there is
scarcely a species in common , and the greater part of the genera and families
also disappear to be replaced by new ones . It is almost universally admitted that
such a ...
Page 20
... no reason for believing that the number of species on the earth at any former
period was much less than at present ; at all events the aquatic portion , with
which geologists have most acquaintance , was probably often as great or
greater .
... no reason for believing that the number of species on the earth at any former
period was much less than at present ; at all events the aquatic portion , with
which geologists have most acquaintance , was probably often as great or
greater .
Page 28
... of the more luxuriant prairies and pampas of America . The greater or less
fecundity of an animal is often considered 28 ON THE TENDENCY OF
VARIETIES TO DEPART.
... of the more luxuriant prairies and pampas of America . The greater or less
fecundity of an animal is often considered 28 ON THE TENDENCY OF
VARIETIES TO DEPART.
Page 29
greater or less fecundity of an animal is often considered to be one of the chief
causes of its abundance or scarcity ; but a consideration of the facts will show us
that it really has little or nothing to do with the matter . Even the least prolific of ...
greater or less fecundity of an animal is often considered to be one of the chief
causes of its abundance or scarcity ; but a consideration of the facts will show us
that it really has little or nothing to do with the matter . Even the least prolific of ...
Page 34
Even a change of colour might , by rendering them more or less distinguishable ,
affect their safety ; a greater or less development of hair might modify their habits .
More important changes , such 34 ON THE TENDENCY OF VARIETIES TO ...
Even a change of colour might , by rendering them more or less distinguishable ,
affect their safety ; a greater or less development of hair might modify their habits .
More important changes , such 34 ON THE TENDENCY OF VARIETIES TO ...
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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 |