Origin of Species Variorum

→ of the structure of various organs; 1859 1860 1861 1866 1869

structure; 1872

→ of use and disuse 1859 1860 1861 1866 1869

OMIT 1872

→ of Growth .— 1859 1860 1861

of Growth . 1866

Variation . 1869 1872

→ modified. 1859 1861 1866 1869 1872

modified. This is a very important subject, most imperfectly understood. 1860

→ This is a very important subject, most imperfectly understood. 1859 1861

The most obvious case is, that modifications accumulated solely for the good of the young or larva, will, it may safely be concluded, affect the structure of the adult; in the same manner as any malconformation affecting the early embryo, seriously affects the whole organisation of the adult. 1860

This is a very important subject, most imperfectly understood, and no doubt totally different classes of facts may be here easily confounded together: we shall presently see that simple inheritance often gives the false appearance of correlation. 1866 1869

This is a very important subject, most imperfectly understood, and no doubt wholly different classes of facts may be here easily confounded together. 1872

↑ 1 blocks not present in 1859 1860 1861 1866 1869; present in 1872

We shall presently see that simple inheritance often gives the false appearance of correlation.

→ The 1859 1860 1861 1866 1869

One of the 1872

→ most obvious case is, that modifications accumulated solely for the good of 1859 1861

several parts of 1860

most obvious instance of real correlation is, that variations of structure arising in 1866 1869

most obvious real cases is, that variations of structure arising in 1872

→ young or larva, will, it may safely be concluded, affect the structure of the adult; in the same manner as any malconformation affecting the early embryo, seriously affects the whole organisation of the adult. 1859 1861

body which are homologous, and which, at an early embryonic period, are alike, seem liable to vary in an allied manner: we see this in the right and left sides of the body varying in the same manner; in the front and hind legs, and even in the jaws and limbs, varying together, for the lower jaw is believed to be homologous with the limbs. 1860

young or in the larvæ naturally tend to affect the structure of the mature animal; in the same manner as any malconformation in the early embryo is known seriously to affect the whole organisation of the adult. 1866 1869

young or larvæ naturally tend to affect the structure of the mature animal. 1872

→ alike, seem 1859 1861

identical in structure, and which are necessarily exposed to similar conditions, seem eminently 1866 1869

identical in structure, and which are neces- sarily exposed to similar conditions, seem eminently 1872

→ to 1859 1861

by some to 1866

by some anatomists to 1869 1872

or use

use,

and disuse, have, in some cases, played a considerable part in the modification of the

constitution

constitution,

and →of the structure of various organs; but that the effects →of use and disuse have often been largely combined with, and sometimes overmastered

by,

the natural selection of innate

variations.

differences.

Correlation

Correlated

Correlation

→ of Growth .—

I mean by this expression that the whole organisation is so tied together during its growth and development, that when slight variations in any one part occur, and are accumulated through natural selection, other parts become →modified. →This is a very important subject, most imperfectly understood. ↑ →The →most obvious case is, that modifications accumulated solely for the good of the →young or larva, will, it may safely be concluded, affect the structure of the adult; in the same manner as any malconformation affecting the early embryo, seriously affects the whole organisation of the adult. The several parts of the body which are homologous, and which, at an early embryonic period, are →alike, seem liable to vary in

a like

an allied

manner: we see this in the right and left sides of the body varying in the same manner; in the front and hind legs, and even in the jaws and limbs, varying together, for the lower jaw is believed →to be homologous with the limbs. These tendencies, I do not doubt, may be mastered more or less completely by natural

selection;

selection:

thus a family of stags once existed with an antler only on one side; and if this had been of any great use to the

breed,

breed

it might probably have been rendered permanent by

~~natural~~

natural

selection.

Homologous parts, as has been remarked by some authors, tend to cohere; this is often seen in monstrous

plants:

plants;

and nothing is more common than the union of homologous parts in normal structures, as

in the

the

union of