Origin of Species Variorum

→ are 1859 1860 1861 1866

in contradistinction to their adaptive resemblances, are 1869 1872

→ in which we have to discover the lines of descent 1859 1860 1861 1866

with the acquired grades of dif- ference, marked 1869

with the acquired grades of difference, marked 1872

→ most 1859 1860 1861 1866

terms, varieties, species, genera, families, &c.; and we have to discover the lines of descent by the most 1869 1872

→ however slight their 1859 1860 1861 1866

whatever they may be and of however slight 1869 1872

→ the same in the 1859 1860

similar in the 1861 1866

the 1869 1872

→ leg 1859 1860 1861 1866

in the leg 1869 1872

→ intelligible 1859 1860 1861 1866 1869

to a large extent, intelligible 1872

→ alike in the 1859 1860 1861 1866

aboriginally alike in an 1869 1872

→ class. 1859 1860 1861 1866

of these classes. 1869 1872

→ tend to reduce an 1859 1860 1861 1866

reduced 1869

have reduced 1872

→ it has become useless by 1859 1860 1861 1866

they have become useless under 1869

rendered useless under 1872

importance in classification; why characters derived from rudimentary parts, though of no service to the

beings,

being,

are often of high classificatory value; and why embryological characters are

often the

the

most valuable of all. The real affinities of all organic

beings,

beings

→are due to inheritance or community of descent. The

Natural

natural

System

system

is a genealogical arrangement, →in which we have to discover the lines of descent by the →most permanent

characters

characters,

→however slight their vital

importance.

importance

~~may~~

may

~~be.~~

be.

The

similar framework

framework

of bones

being

→the same in the hand of a man, wing of a bat, fin of

the

porpoise, and leg of the horse,— the same number of vertebræ forming the neck of the giraffe and of the elephant,— and innumerable other such facts, at once explain themselves on the theory of descent with slow and slight successive modifications. The similarity of pattern in the wing and →leg of a bat, though used for such different purpose,— in the jaws and legs of a crab,— in the petals, stamens, and pistils of a

flower

flower,

likewise,

likewise

→intelligible on the view of the gradual modification of parts or organs, which were →alike in the early progenitor

each →class. On the principle of successive variations not always supervening at an early age, and being inherited at a corresponding not early period of life, we

~~can~~

can

clearly see why the embryos of mammals, birds, reptiles, and fishes

are

should be

so closely

similar,

alike,

and

are

~~should be~~

should be