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1859
1860
1861
1866
1869
1872

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1859
1860
1866
1869
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

of the corolla 1859 1860 1861 1866 1869
OMIT 1872

the 1859 1860 1861 1866 1869
with birds the 1872

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 the petals of the corolla into a tube. Hard parts seem to affect the
forms
form
of adjoining soft parts; it is believed by some authors that the diversity in the shape of the pelvis
in birds
in birds
causes the remarkable diversity in the shape of their kidneys. Others believe that the shape of the pelvis in the human mother influences by pressure the shape of the head of the child. In snakes,