| → ancient languages had altered very 1869 1872 | 
| very ancient language had altered 1859 1860 1861 1866 | 
  | 
| → had altered much owing 1869 1872 | 
| (owing 1859 1860 1861 1866 | 
  | 
| → races, 1869 1872 | 
| from a common race) had altered much, 1859 1860 1861 | 
| from a common stock) had altered much, 1866 | 
  | 
| → the species, with the 1869 1872 | 
| species, with 1859 1860 1861 1866 | 
  | 
| → the varieties; and in some cases, as with the domestic pigeon, with 1872 | 
| varieties; and with our domestic productions, 1859 1860 1861 1866 | 
| the varieties; and in some cases, as with domestic pigeons, 1869 | 
  | 
| ↑ 1 blocks not present in  1869 1872; present in  1859 1860 1861 1866 | 
|  The origin of the existence of groups subordinate to groups, 
is the same with varieties as with species, namely, closeness of descent with various degrees of modification. 
 | 
  | 
| → as in classifying 1869 1872 | 
| in classifying varieties, as with 1859 1860 1861 1866 | 
  | 
| → of the sub-varieties differ 1869 1872 | 
| sub-varieties differ from the others 1859 1860 1861 1866 | 
  | 
| → the length of the 1872 | 
| having a longer 1859 1860 1861 1866 1869 | 
  |