Origin of Species Variorum

→ any country which they inhabited. 1869 1872

their native countries. 1859 1860 1861 1866

→ in England by 1866 1869 1872

by 1859 1860 1861

→ advanced, as proving that acclimatisation cannot be effected, 1872

advanced— 1859 1860 1861

advanced — 1866 1869

→ was! 1872

was— as proving that acclimatisation cannot be effected! 1859 1860 1861

was — as proving that acclimatisation cannot be effected! 1866 1869

→ are 1872

appeared to be 1859 1860 1861

were 1866 1869

→ others; and of this fact I have myself observed striking instances. 1869 1872

others. 1859 1860 1861

others; and of this fact I have myself observed a striking instance. 1866

→ structure; 1872

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

→ OMIT 1872

of use and disuse 1859 1860 1861 1866 1869

→ 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 wholly different classes of facts may be here easily confounded together. 1872

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

→ One of the 1872

The 1859 1860 1861 1866 1869

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

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

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

alike, seem 1859 1861

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

natural

selection

selec- tion

will continually

would inevitably

tend to preserve those individuals which

are

were

born with constitutions best adapted to →any country which they inhabited. In treatises on many kinds of cultivated plants, certain varieties are said to withstand certain climates better than

others:

others;

this is

very

....

strikingly shown in works on

fruit trees

fruit-trees

published in the United States, in which certain varieties are habitually recommended for the

northern,

northern

and others for the southern

states;

States;

and as most of these varieties are of recent origin, they cannot owe their constitutional differences to habit. The case of the Jerusalem artichoke, which is never propagated →in England by seed, and of which consequently new varieties have not been produced, has even been →advanced, as proving that acclimatisation cannot be effected, for it is now as tender as ever it →was! The

case

case,

also, of the kidney-bean has been often cited for a similar purpose, and with much greater weight; but until some one will sow, during a score of generations, his kidney-beans so early that a very large proportion

I are

are

destroyed by frost, and then collect seed from the few survivors, with care to prevent accidental crosses, and then again get seed from these seedlings, with the same precautions, the experiment cannot be said to have been

even

....

tried. Nor let it be supposed that

....

differences in the constitution of seedling kidney-beans

ever

never

appear, for an account has been published how much more hardy some seedlings →are than →others; and of this fact I have myself observed striking instances.

On the whole,

I think

....

we may conclude that habit,

use,

or use

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

constitution,

constitution

and →structure; but that the effects →OMIT 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 wholly different classes of facts may be here easily confounded together. We shall presently see that simple inheritance often gives the false appearance of correlation. →One of the →most obvious real cases is, that variations of structure arising in the →young or larvæ naturally tend to affect the structure of the mature animal. The several parts of the body which are homologous, and which, at an early embryonic period, are →identical in structure, and which are neces- sarily exposed to similar conditions, seem eminently liable to vary in

an allied

a like