Origin of Species Variorum

→ When the 1869

when the 1859 1860 1861 1866

the central flower thus becoming peloric or regular. When the 1872

→ not quite aborted but is 1869 1872

only 1859 1860 1861 1866

→ in the central and exterior flowers, 1869

of the central and exterior flowers of a head or umbel, I do not feel at all sure that C. c. 1859 1860 1861

of the central and exterior flowers of a head or umbel, I do not feel at all sure that c. c. 1866

OMIT 1872

→ or necessary for 1869 1872

in 1859 1860 1861 1866

→ these plants, is highly probable; 1869 1872

plants of these two orders, is so far-fetched, as it may at first appear: 1859 1860 1861

plants of these two orders, is so far-fetched as it may at first appear: 1866

→ so, 1869 1872

it be advantageous, 1859 1860 1861 1866

→ seeds, it seems impossible that their differences in shape, which are not always correlated with any difference in the 1869 1872

differences both in the internal and external structure of the seeds, which are not always correlated with any differences in the 1859 1860 1861

differences in the 1866

→ corolla, 1869 1872

flowers, it seems impossible that they 1859 1860 1861 1866

→ beneficial: 1869

advantageous to the plant: 1859 1860 1861 1866

beneficial; 1872

→ sometimes 1869 1872

in some cases, according to Tausch, 1859 1860 1861 1866

→ as before remarked, we see that 1869

we see that 1859 1860 1861 1866

OMIT 1872

→ variation and correlation, 1869 1872

correlated growth, and 1859 1860 1861 1866

→ correlated in some necessary manner. 1859 1860 1861 1866 1869

in some necessary manner correlated. 1872

→ acts. 1869

can alone act. 1872

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

So, again, I do not doubt that some apparent correlations, occurring throughout whole orders, are entirely due to the manner alone in which natural selection can act.

when this occurs, the adherent nectary is quite

aborted;

aborted.

→When the colour is absent from only one of the two upper petals, the nectary is →not quite aborted but is much shortened.

With respect to the

difference in

development of

the

corolla,

corolla

→in the central and exterior flowers,

Sprengel's

Sprengels

idea that the ray-florets serve to attract insects, whose agency is highly advantageous →or necessary for the fertilisation of →these plants, is highly probable; and if →so, natural selection may have come into play. But

in regard

with respect

to the →seeds, it seems impossible that their differences in shape, which are not always correlated with any difference in the →corolla, can be in any way →beneficial: yet in the Umbelliferæ these differences are of such apparent

importance—

importance —

the seeds being →sometimes orthospermous in the exterior flowers and cœlospermous in the central

flowers,—

flowers, —

that the elder De Candolle founded his main divisions

the order on

analogous differences.

such characters.

Hence

Hence,

→as before remarked, we see that modifications of structure, viewed by systematists as of high value, may be wholly due to

unknown

the

laws of →variation and correlation, without being, as far as we can

see,

judge,

of the slightest service to the species.

We may often falsely attribute to

correlation

correlated

of growth,

of growth

variation

structures which are common to whole groups of species, and which in truth are simply due to inheritance; for an ancient progenitor may have acquired through natural selection some one modification in structure, and, after thousands of generations, some other and independent modification; and these two modifications, having been transmitted to a whole group of descendants with diverse habits, would naturally be thought to be →correlated in some necessary manner. Some

other correlations

correlations

are apparently due to the manner in which natural selection →acts. ↑ For instance, Alph.

Candolle has