Comparison with 1872 |
|
determine
quicker
extermination from the greater amount of requisite food. Before man inhabited India or Africa, some cause must have checked the continued increase of the existing elephant. A highly capable judge
believes that at the present day insects (as Bruce has likewise described in Abyssinia),
from incessantly harassing and weakening the elephant,
are one chief check to
its
increase; and this was Bruce's conclusion with respect to the African elephant in Abyssinia. increase; and this was Bruce's conclusion with respect to the African elephant in Abyssinia. 1866 1872 |
increase. 1861 |
increase; and this was Bruces conclusion with respect to the African elephant in Abyssinia. 1869 |
It is certain that insects of different kinds,
and blood-sucking bats,
determine the existence of the larger naturalised quadrupeds in several parts of S.
America.
America.
1872 |
America.
1861 1866 1869 |
We see in many cases in the more recent tertiary formations, that rarity precedes extinction; and we know that this has been the progress of events with those animals which have been exterminated, either locally or wholly, through
man's man's 1859 1860 1861 1866 1872 | mans 1869 |
agency. I may repeat what I published in 1845, namely, that to admit that species generally become rare before they become extinct— to feel no surprise at the rarity of a species, and yet to marvel greatly when it
ceases to exist, is much the same as to admit that sickness in the individual is the forerunner of death— to feel no surprise at sickness, but
when the sick man dies, to wonder and to suspect that he died by some unknown
deed of violence. |
|
The theory of natural selection is grounded on the belief that each new variety, and ultimately each new species, is produced and maintained by having some advantage over those with which it comes into competition;
and the consequent extinction of less-favoured
forms almost inevitably follows. It is the same with our domestic productions:
when a new and slightly improved variety has been raised, it at first supplants
the less improved varieties in the same neighbourhood;
|
determine, determine, 1866 1869 1872 | determine 1861 |
as has been remarked by Owen, quicker as has been remarked by Owen, quicker 1866 1869 1872 |
quicker 1861 |
extermination from the greater amount of requisite food. Before man inhabited India or Africa, some cause must have checked the continued increase of the existing elephant. A highly capable
judge, judge, 1866 1869 1872 | judge 1861 |
Dr. Falconer, believes that it is chiefly insects which, Dr. Falconer, believes that it is chiefly insects which, 1866 1869 1872 |
believes that at the present day insects (as Bruce has likewise described in Abyssinia), 1861 |
from incessantly harassing and weakening the
elephant elephant 1866 1869 1872 | elephant, 1861 |
in India, check in India, check 1866 1869 1872 |
are one chief check to 1861 |
its
increase; and this was Bruces conclusion with respect to the African elephant in Abyssinia. increase; and this was Bruces conclusion with respect to the African elephant in Abyssinia. 1869 |
increase. 1861 |
increase; and this was Bruce's conclusion with respect to the African elephant in Abyssinia. 1866 1872 |
It is certain that insects
...OMIT 1866 1869 1872 |
of different kinds, 1861 |
and blood-sucking
bats bats 1866 1869 1872 | bats, 1861 |
determine the existence of the larger naturalised quadrupeds in several parts of S.
America.
America.
1861 1866 1869 |
America.
1872 |
We see in many cases in the more recent tertiary formations, that rarity precedes extinction; and we know that this has been the progress of events with those animals which have been exterminated, either locally or wholly, through
mans mans 1869 | man's 1859 1860 1861 1866 1872 |
agency. I may repeat what I published in 1845, namely, that to admit that species generally become rare before they become extinct— to feel no surprise at the rarity of a species, and yet to marvel greatly when
the species the species 1866 1869 1872 | it 1859 1860 1861 |
ceases to exist, is much the same as to admit that sickness in the individual is the forerunner of death— to feel no surprise at sickness,
but, but, 1866 1869 1872 | but 1859 1860 1861 |
when the sick man dies, to wonder and to suspect that he died by some
....... 1866 1869 1872 | unknown 1859 1860 1861 |
deed of violence. |
|
The theory of natural selection is grounded on the belief that each new variety, and ultimately each new species, is produced and maintained by having some advantage over those with which it comes into
competition; competition; 1859 1860 1866 1869 1872 | compe- tition; 1861 |
and the consequent extinction of
the less-favoured the less-favoured 1866 1869 1872 | less-favoured 1859 1860 1861 |
forms almost inevitably follows. It is the same with our domestic
productions; productions; 1866 1869 1872 | productions: 1859 1860 1861 |
when a new and slightly improved variety has been raised, it at first
supplants supplants 1859 1860 1861 1869 1872 | generally supplants 1866 |
the less improved varieties in the same neighbourhood;
|