Origin of Species Variorum

→ OMIT 1869 1872

to have been 1859 1860 1861 1866

→ have been partially 1869

a certain extent 1859 1860 1861 1866

have become partially 1872

→ the comparison not 1859 1860 1861 1866 1869

serial homologies, or the comparison 1872

→ or organs in different members of the same class, but 1869

in different members of a class, but 1859 1860 1861

or organ in different members of the same class, but 1866

or organs in the same individual, and not 1872

→ the same individual. 1859 1860 1861 1866 1869

different members of the same class. 1872

→ all the higher vertebrate 1869 1872

each member of the vertebrate and articulate 1859 1860 1861

all the members of the vertebrate 1866

→ So it is with 1866 1869 1872

We see the same law in comparing 1859 1860 1861

→ during the early or embryonic stages of development in flowers, 1869 1872

in embryonic crustaceans and in many other animals, and in flowers, 1859 1860 1861

in flowers during their early development, as well as in crustaceans and many other animals during their embryonic states, 1866

→ as well as in crustaceans and many other animals, that 1869 1872

that 1859 1860 1861 1866

→ first 1869 1872

an early stage of growth 1859 1860 1861 1866

→ these facts 1859 1860 1861 1866 1869

the cases of serial homologies 1872

function

functions

of the mouths of insects. Nevertheless, it is conceivable that the general pattern of an organ might become so much obscured as to be finally lost, by the

atrophy

reduction

and ultimately by the complete abortion of certain parts, by the

soldering together

fusion

of other parts, and by the doubling or multiplication of others,—

varia- tions

variations

which we know to be within the limits of possibility. In the paddles of the

extinct gigantic

gigantic extinct

sea-lizards, and in the mouths of certain suctorial crustaceans, the general pattern seems →OMIT thus to →have been partially obscured.

There is another and equally curious branch of

the present

our

our present

subject; namely, →the comparison not of the

different

same

part

parts

→or organs in different members of the same class, but of the

same

different

parts or organs in →the same individual. Most physiologists believe that the bones of the skull are

homologous—

homologous with—

that

is,

correspond in number and in relative

connexion—

connexion with—

with the

the

elemental parts of a certain number of vertebræ. The anterior and posterior limbs in →all the higher vertebrate classes are plainly homologous. →So it is with the wonderfully complex jaws and legs

crustaceans. It is familiar to almost every one, that in a flower the relative position of the sepals, petals, stamens, and pistils, as well as their intimate structure, are intelligible on the view that they consist of metamorphosed leaves, arranged in a spire. In monstrous plants, we often get direct evidence of the possibility of one organ being transformed into another; and we can actually

see

see,

→during the early or embryonic stages of development in flowers, →as well as in crustaceans and many other animals, that organs, which when mature become extremely

different

different,

are at →first 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

extraordinarily

extraordinary

extra-ordinarily

extraor- dinarily