Origin of Species Variorum

→ species under apparently the same 1861 1866

species under the same 1859 1860

external 1869 1872

→ to lay very little 1859 1860 1861 1866

not to lay much 1869

to lay less 1872

→ action 1859 1860 1861 1866 1872

and definite action 1869

→ conditions of life. 1859 1860 1861 1866

conditions of life; but I fully admit that strong arguments of a general nature may be advanced on the other side. 1869

surrounding conditions, than on a tendency to vary, due to causes of which we are quite ignorant. 1872

→ a far-fetched sense, however, 1866

one sense 1869 1872

→ but 1866 1869

either directly or indirectly, but 1872

→ it depends on the nature of 1866

OMIT 1869 1872

→ we see in selection by man, that these 1866

when man is the selecting agent, we clearly see that the 1869 1872

→ the conditions under domestication causing the variability, and 1866

the conditions cause the variability; 1869

variability is in some manner excited, but it is 1872

→ acting either consciously or unconsciously, 1866 1869

which 1872

→ directions. 1866

directions, and this answers to the survival of the fittest under nature. 1869

directions; and it is this latter agency which answers to the survival of the fittest under nature. 1872

→ Use and Disuse, as controlled by Natural Selection. 1866

Use and Disuse .— 1859 1860 1861

Use and Disuse, as controlled by Natural Selection . 1869

the increased Use and Disuse of Parts, as controlled by Natural Selection . 1872

well be conceived; and, on the other hand, of

dissimilar

different

varieties being produced

under apparently

from

the same →species under apparently the same conditions. Such facts show how indirectly the conditions of life

must

....

act. Again, innumerable instances are known to every

naturalist,

naturalist

of species keeping true, or not varying at all, although living under the most opposite climates. Such considerations as these incline me →to lay very little weight on the direct →action of the →conditions of life. Indirectly, as already remarked, they seem to play an important part in affecting the reproductive system, and in thus inducing variability; and natural selection will then accumulate all profitable variations, however slight, until they become plainly developed and appreciable by us.

In →a far-fetched sense, however, the conditions of life may be said, not only to cause variability, →but likewise to include natural

selection,

selection;

for →it depends on the nature of the conditions

determine whether

whether

this or that variety shall

survive.

be preserved.

But →we see in selection by man, that these two elements of change are

~~essenitally~~

essenitally