of more
special use to that progenitor, or its progenitors, than they now are to these animals having such widely diversified habits. special use to that progenitor, or its progenitors, than they now are to these animals having such widely diversified habits. 1859 1860 1861 1866 |
special use than they now are to these animals with their widely diversified habits, and might consequently have been modified through natural selection. 1869 |
numerous bones in the fin of some ancient fish-like progenitor of the whole class. 1872 |
↑1 blocks not present in 1859 1860 1861 1866 1869; present in 1872 | It is scarcely possible to decide how much allowance ought to be made for such causes of change, as the definite action of external conditions, so-called spontaneous variations, and the complex laws of growth; but with these important exceptions, we may conclude that the structure of every living creature either now is, or was formerly, of some direct or indirect use to its possessor.
|
Therefore Therefore 1859 1860 1861 1866 |
Making due allowance for the definite action of changed conditions, correlation, reversion, &c., 1869 |
we may
infer infer 1859 1860 1861 1866 | conclude 1869 |
that
these several bones might have been acquired through natural selection, subjected formerly, as now, to the several these several bones might have been acquired through natural selection, subjected formerly, as now, to the several 1859 1860 1861 1866 |
every detail of structure in every living creature is either now or was formerly of use,—directly or indirectly through the complex 1869 |
laws of
inheritance, reversion, correlation of growth, &c. Hence every detail of structure in every living creature (making some little allowance for the direct action of physical conditions) may be viewed, either as having been of special use to some ancestral form, or as being now of special use to the descendants of this form— either directly, or indirectly through the complex laws of growth. inheritance, reversion, correlation of growth, &c. Hence every detail of structure in every living creature (making some little allowance for the direct action of physical conditions) may be viewed, either as having been of special use to some ancestral form, or as being now of special use to the descendants of this form— either directly, or indirectly through the complex laws of growth. 1859 1860 |
inheritance, reversion, correlation of growth, &C. Hence every detail of structure in every living creature (making some little allowance for the direct action of physical conditions) may be viewed, either as having been of special use to some ancestral form, or as being now of special use to the descendants of this form— either directly, or indirectly through the complex laws of growth. 1861 |
inheritance, reversion, correlation of growth, &C. Hence every detail of structure in every living creature (making some little allowance for the direct action of physical conditions) may be viewed, either as having been of special use to some ancestral form, or as being now of special use to the descendants of this form—either directly, or indirectly through the complex laws of growth. 1866 |
growth. 1869 |
|