Whatever the cause may be of each slight difference
in | in 1859 1860 1861 1866 | | between 1869 1872 |
| from 1859 1860 1861 1866 | | and 1869 1872 |
| parents— 1859 1860 1861 1872 | | parents — 1866 1869 |
| exist— 1859 1860 1861 1872 | | exist — 1866 1869 |
| it 1859 1860 1861 1866 1869 |
| we have reason to believe that it 1872 |
| accumulation, 1859 1860 1861 1866 1869 | | accumulation 1872 |
| through natural selection, of such differences, when beneficial to the individual, that 1859 1860 1861 1866 |
| through natural selection, of beneficial differences that has 1869 |
| of beneficial differences which has 1872 |
| gives 1859 1860 1861 1866 | | given 1869 1872 |
| the more important 1859 1860 1861 1866 1872 |
| those 1869 |
| structure, 1859 1860 1861 1866 | | structure 1869 1872 |
| by which the innumerable beings on the face of this earth are enabled to struggle with each other, and the best adapted to survive. 1859 1860 1861 1866 |
| which are the most important for the welfare of each species. 1869 |
| in relation to the habits of each species. 1872 |
|
