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

→ Variation . 1869 1872

of Growth .— 1859 1860 1861

of Growth . 1866

→ 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, 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. 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 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 instance of real correlation is, that variations of structure arising in 1866 1869

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

several parts of 1860

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

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

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

alike, seem 1859 1861

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

→ by some anatomists to 1869 1872

to 1859 1861

by some to 1866

use,

or 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

differences.

variations.

Correlation

Correlated

→ Variation .

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, 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. ↑ →The →most obvious instance of real correlation is, that variations of structure arising in the →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. The several parts of the body which are homologous, and which, at an early embryonic period, are →identical in structure, and which are necessarily exposed to similar conditions, seem eminently liable to vary in

an allied

a like

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 →by some anatomists 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