| → in a state of nature — had been 1866 1869 |
| in a state of nature— had been 1859 1860 1861 |
| under nature— were 1872 |
|
| → fact of variations and monstrosities occurring much more frequently 1869 1872 |
| much greater variability, as well as the greater frequency of monstrosities, 1859 1860 1861 1866 |
|
| → and the greater variability of species having wide ranges than of those having restricted ranges, lead 1869 |
| leads me to believe that deviations of structure are in some way due 1859 1860 |
| leads to the belief that deviations of structure are in some way due 1861 1866 |
| and the greater variability of species having wide ranges than of those with restricted ranges, lead 1872 |
|
| → conclusion that variability is directly related to 1869 |
| nature of 1859 1860 1861 1866 |
| conclusion that variability is generally related to 1872 |
|
| → each species has 1869 1872 |
| the parents and their more remote ancestors have 1859 1860 1861 1866 |
|
| → In 1869 1872 |
| I have remarked in 1859 1860 1861 1866 |
|
| → chapter I attempted 1869 1872 |
| chapter— but a long catalogue of facts which cannot be here given would be necessary 1859 1860 1861 |
| chapter — but a long catalogue of facts which cannot be here given would be necessary 1866 |
|
|
CHAPTER V. |
| LAWS OF VARIATION. |
| Effects of
conditions — Use and disuse, combined with natural selection; organs of flight and of vision — Acclimatisation —
— Compensation and economy of growth — False correlations — Multiple, rudimentary, and lowly organised structures variable — Parts developed in an unusual manner are highly variable: specific characters more variable than generic: secondary sexual characters variable — Species of the same genus vary in an analogous manner — Reversions to
characters — Summary. |
| I HAVE hitherto sometimes spoken as if the
so common and multiform
organic beings under domestication, and in a lesser degree
those
→in a state of nature — had been
due to chance. This, of course, is a wholly incorrect expression, but it serves to acknowledge plainly our ignorance of the cause of each particular variation. Some authors believe it to be as much the function of the reproductive system to produce individual differences, or
slight deviations of structure, as to make the child like its parents. But the
→fact of variations and monstrosities occurring much more frequently
under domestication
than under nature,
→and the greater variability of species having wide ranges than of those having restricted ranges, lead
to the
→conclusion that variability is directly related to
the conditions of
to which
→each species has
been exposed during several
→In
the first
→chapter I attempted
|
