Comparison with 1872 |
|
existing
....... 1869 1872 | and allied 1859 1860 1861 | allied 1866 |
groups. Recent forms are generally looked
upon upon 1872 | at 1859 1860 1861 1866 1869 |
as being,
on the whole, higher in the scale of organisation on the whole, higher in the scale of organisation 1869 1872 |
in some vague sense, higher 1859 1860 |
on the whole, higher 1861 1866 |
than ancient
....... 1869 1872 | and extinct 1859 1860 1861 1866 |
forms; and they
must be higher, must be higher, 1869 1872 |
are 1859 1860 1861 1866 |
in so far in so far 1869 1872 |
in so far higher 1859 1860 1861 |
higher in so far 1866 |
as the later and more improved forms have conquered the older and less improved
forms forms 1869 1872 | organic beings 1859 1860 1861 1866 |
in the struggle for
life; they have also generally had their organs more specialised for different functions. life; they have also generally had their organs more specialised for different functions. 1872 |
life. 1859 1860 |
life; they will also generally have had their organs more specialised for different functions. 1861 1866 |
life; they have also generally had their organs more specialized for different functions. 1869 |
This fact is perfectly compatible with numerous beings still retaining
....... 1869 1872 | a 1861 1866 |
simple and
but little improved structures, but little improved structures, 1869 1872 |
little improved organisation 1861 1866 |
fitted for simple conditions of life; it is likewise compatible with some forms having retrograded in organisation,
by having become at each stage by having become at each stage 1869 1872 |
though becoming under each grade 1861 1866 |
of descent better fitted for
new new 1872 | their changed 1861 1866 | changed 1869 |
and degraded habits of life. Lastly, the
wonderful law wonderful law 1869 1872 | law 1859 1860 1861 1866 |
of the long endurance of allied forms on the same continent,— of marsupials in Australia, of edentata in America, and other such cases,— is intelligible, for
within the same within the same 1872 |
within a confined 1859 1860 1861 1866 |
generally within the same 1869 |
country country 1872 | country, 1859 1860 1861 1866 1869 |
the
existing existing 1869 1872 | recent 1859 1860 1861 1866 |
and the extinct will naturally
be allied
by descent. |
|
Looking to geographical distribution, if we admit that there has been during the long course of ages much migration from one part of the world to another, owing to former climatal and geographical changes and to the many occasional and unknown means of dispersal, then we can understand, on the theory of descent with modification, most of the great leading facts in Distribution. We can see why there should be so striking a parallelism in the distribution of organic beings throughout space, and in their geological succession throughout time; for in both cases the beings have been connected by the bond of ordinary generation, and the means of modification have been the same. We see the full meaning of the wonderful fact, which must have
struck every traveller, namely, that on the same continent, under the most diverse conditions, under heat and cold, on mountain and lowland, on deserts and marshes, most
|
existing
allied allied 1866 | and allied 1859 1860 1861 | allied 1869 1872 |
groups. Recent forms are generally looked
at at 1859 1860 1861 1866 1869 | upon 1872 |
as being,
on the whole, higher on the whole, higher 1861 1866 |
in some vague sense, higher 1859 1860 |
on the whole, higher in the scale of organisation 1869 1872 |
than ancient
and extinct and extinct 1859 1860 1861 1866 | and extinct 1869 1872 |
forms; and they
are are 1859 1860 1861 1866 |
must be higher, 1869 1872 |
higher in so far higher in so far 1866 |
in so far higher 1859 1860 1861 |
in so far 1869 1872 |
as the later and more improved forms have conquered the older and less improved
organic beings organic beings 1859 1860 1861 1866 | forms 1869 1872 |
in the struggle for
life; they will also generally have had their organs more specialised for different functions. life; they will also generally have had their organs more specialised for different functions. 1861 1866 |
life. 1859 1860 |
life; they have also generally had their organs more specialized for different functions. 1869 |
life; they have also generally had their organs more specialised for different functions. 1872 |
This fact is perfectly compatible with numerous beings still retaining
a
simple and
little improved organisation little improved organisation 1861 1866 |
but little improved structures, 1869 1872 |
fitted for simple conditions of life; it is likewise compatible with some forms having retrograded in organisation,
though becoming under each grade though becoming under each grade 1861 1866 |
by having become at each stage 1869 1872 |
of descent better fitted for
their changed their changed 1861 1866 | changed 1869 | new 1872 |
and degraded habits of life. Lastly, the
law law 1859 1860 1861 1866 | wonderful law 1869 1872 |
of the long endurance of allied forms on the same continent,— of marsupials in Australia, of edentata in America, and other such cases,— is intelligible, for
within a confined within a confined 1859 1860 1861 1866 |
generally within the same 1869 |
within the same 1872 |
country, country, 1859 1860 1861 1866 1869 | country 1872 |
the
recent recent 1859 1860 1861 1866 | existing 1869 1872 |
and the extinct will
....... 1866 1869 1872 | naturally 1859 1860 1861 |
be
closely allied closely allied 1866 1869 1872 | allied 1859 1860 1861 |
by descent. |
|
Looking to geographical distribution, if we admit that there has been during the long course of ages much migration from one part of the world to another, owing to former climatal and geographical changes and to the many occasional and unknown means of dispersal, then we can understand, on the theory of descent with modification, most of the great leading facts in Distribution. We can see why there should be so striking a parallelism in the distribution of organic beings throughout space, and in their geological succession throughout time; for in both cases the beings have been connected by the bond of ordinary generation, and the means of modification have been the same. We see the full meaning of the wonderful fact, which
has has 1866 1869 1872 | must have 1859 1860 1861 |
struck every traveller, namely, that on the same continent, under the most diverse conditions, under heat and cold, on mountain and lowland, on deserts and marshes, most
|