Origin of Species Variorum

↑ 3 blocks not present in 1866 1869 1872; present in 1859 1860 1861

Thus it might be a great advantage to the hive-bee to have a slightly longer or differently constructed proboscis. On the other hand, I have found by experiment that the fertility of clover greatly depends on bees visiting and moving parts of the corolla, so as to push the pollen on to the stigmatic surface. Hence, again, if humble-bees were to become rare in any country, it might be a great advantage to the red clover to have a shorter or more deeply divided tube to its corolla, so that the hive-bee could visit its flowers.

→ in the most perfect manner 1859 1860 1861 1866

OMIT 1869 1872

→ continued 1859 1860 1861 1866

most perfect manner, by the continued 1869 1872

→ individuals presenting slight 1866

individuals presenting mutual and slightly favourable 1859 1860 1861

all the individuals which presented slight 1869 1872

→ structure mutually favourable to each other. 1866 1869 1872

structure. 1859 1860 1861

→ action, for instance, of the coast-waves, called at trifling and insignificant cause, when applied to 1866

action, for instance, of the coast-waves, called a trifling and insignificant cause, when applied to 1859 1860 1861

agencies still at work, spoken of as trifling or insignificant, when applied to 1869

agencies which we see still at work, spoken of as trifling or insignificant, when used in explaining 1872

→ if it be a true principle, 1859 1860 1861 1866 1869

OMIT 1872

→ (with the exception of the curious and not well-understood 1860 1861 1866 1869 1872

unite for each birth; but in the 1859

→ parthenogenesis) unite for each birth; but in the case of hermaphrodites 1860 1861 1866 1869 1872

hermaphrodites 1859

→ I am strongly inclined 1859 1860 1861 1866

there is reason 1869 1872

→ was first 1860 1861 1866 1869

I may add, was first 1859

was long ago doubtfully 1872

enabled

induced

to suck its flowers. ↑ Thus I can understand how a flower and a bee might slowly become, either simultaneously or one after the other, modified and adapted →in the most perfect manner to each

other

other,

the →continued preservation of →individuals presenting slight deviations of →structure mutually favourable to each other.

I am well aware that this doctrine of natural selection, exemplified in the above imaginary instances, is open to the same objections which were

first urged against Sir Charles Lyell's noble views on "the modern changes of the earth, as illustrative of geology;" but we now

very

....

seldom hear the →action, for instance, of the coast-waves, called at trifling and insignificant cause, when applied to the excavation of

the deepest

gigantic

valleys or

the formation of

long

the longest

lines of inland cliffs. Natural selection

~~can~~

can

acts

act

only by the preservation and accumulation of

infinitesimally

....

small inherited modifications, each profitable to the preserved being; and as modern geology has almost banished such views as the excavation of a great valley by a single diluvial wave, so will natural

selec- tion,

selection

selection,

→if it be a true principle, banish the belief of the continued creation of new organic beings, or of any great and sudden

modification

modifications

in their structure.

the

Intercrossing

Individuals .—

Individuals. —

Individuals.

I must here introduce a short digression. In the case of animals and plants with separated sexes, it is of course obvious that two individuals must always →(with the exception of the curious and not well-understood

case

cases

of →parthenogenesis) unite for each birth; but in the case of hermaphrodites this is far from obvious. Nevertheless →I am strongly inclined to believe that with all hermaphrodites two individuals, either occasionally or habitually, concur for the reproduction of their kind. This

view,

view

→was first