Origin of Species Variorum

→ an early stage of growth 1859 1860 1861 1866

first 1869 1872

→ these facts 1859 1860 1861 1866 1869

the cases of serial homologies 1872

→ bone? 1859 1860 1861 1866 1869

bone, apparently representing vertebræ? 1872

→ birds. 1859 1860 1861

birds and reptiles. 1866 1869 1872

→ in the formation of 1859 1860 1861 1866

to form 1869 1872

→ purposes? 1859 1860 1861 1866 1869

purposes, namely flying and walking? 1872

→ satisfactorily 1859 1860 1861 1866

to a certain extent, 1872

OMIT 1869

→ In the vertebrata, we see 1859 1860 1861 1866 1869

We need not here consider how the bodies of some animals first became divided into 1872

→ internal vertebræ bearing certain processes and appendages; in the articulata, we see the body 1859 1860 1861 1866

internal vertebræ bearing certain processes; in the articulata, the body 1869

segments, or how they became 1872

→ a series of segments, bearing external appendages; and in flowering plants, we see a series of successive spiral whorls of leaves. 1859 1860 1861 1866

a series of segments, bearing external appendages; and in flowering plants, spiral whorls of leaves. 1869

right and left sides, with corresponding organs, for such questions are almost beyond investigation. 1872

↑ 2 blocks not present in 1859 1860 1861 1866 1869; present in 1872

It is, however, probable that some serial structures are the result of cells multiplying by division, entailing the multi- plication of the parts developed from such cells. It must suffice for our purpose to bear in mind that an indefinite repetition of the same part or organ is the common characteristic, as Owen has remarked, of all low or little specialised forms; therefore the unknown progenitor of the Vertebrata probably possessed many vertebræ; the unknown progenitor of the Articulata, many segments; and the unknown progenitor of flowering plants, many leaves arranged in one or more spires.

→ we may readily believe that 1859 1860 1861 1866

OMIT 1869

→ possessed 1859 1860 1861 1866

no doubt possessed 1869

→ spiral whorls of leaves. 1859 1860 1861 1866

leaves arranged in one or more spires. 1869

→ in number and structure; consequently it is quite probable that natural selection, during a long-continued course of modification, should have seized on a certain number of the primordially similar elements, many times repeated, and have adapted them to the most diverse purposes. 1859 1860 1861 1866

in number and structure. 1869

not only in number, but in form. 1872

become extremely

different

different,

are at →an early stage of growth exactly alike.

How inexplicable are →these facts on the ordinary view of creation! Why should the brain be enclosed in a box composed of such numerous and such

extraordinary

extra-ordinarily

extraor- dinarily

extraordinarily

shaped pieces of →bone? As Owen has remarked, the benefit derived from the yielding of the separate pieces in the act of parturition

mammals, will by no means explain the same construction in the skulls of →birds. Why should similar bones have been created →in the formation of the wing and

the leg

leg

of a bat, used as they are for such totally different →purposes? Why should one crustacean, which has an extremely complex mouth formed of many parts, consequently always have fewer legs; or conversely, those with many legs have simpler mouths? Why should the sepals, petals, stamens, and

pistils,

pistils

each

any individual

flower, though fitted for such

distinct

widely different

purposes, be all constructed on the same pattern?

On the theory of natural selection, we

can,

can

→satisfactorily answer these questions. →In the vertebrata, we see a series of →internal vertebræ bearing certain processes and appendages; in the articulata, we see the body divided into →a series of segments, bearing external appendages; and in flowering plants, we see a series of successive spiral whorls of leaves. ↑ An indefinite repetition of the same part or organ is the common

characteristic,

characteristic

(as

Owen has

observed,

observed)

of all low or

little modified

little-modified

forms; therefore →we may readily believe that the unknown progenitor of the vertebrata →possessed many vertebræ; the unknown progenitor of the articulata, many segments; and the unknown progenitor of flowering plants, many →spiral whorls of leaves. We have

also formerly

formerly

seen that parts many times repeated are eminently liable to

vary,

vary

→in number and structure; consequently it is quite probable that natural selection, during a long-continued course of modification, should have seized on a certain number of the primordially similar elements, many times repeated, and have adapted them to the most diverse purposes.