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1859
1860
1861
1866
1869
1872

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1860
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offer in vain 1859 1860 1861 1866 1872
in vain offer 1869

1 blocks not present in 1859 1860 1861; present in 1866 1869 1872
That this nectar is much liked by the hive-bee is certain; for I have repeatedly seen, but only in the autumn, many hive-bees sucking the flowers through holes in the base of the tube which had been bitten by humble-bees.

I have found by experiment that 1859 1860
OMIT 1861

greatly 1859
as previously stated, 1861
OMIT 1860

visiting and moving parts of the corolla, 1859 1860
moving the petals, 1861

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 mutual and slightly favourable 1859 1860 1861
individuals presenting slight 1866
all the individuals which presented slight 1869 1872

structure. 1859 1860 1861
structure mutually favourable to each other. 1866 1869 1872

action, for instance, of the coast-waves, called a trifling and insignificant cause, when applied to 1859 1860 1861
action, for instance, of the coast-waves, called at trifling and insignificant cause, when applied to 1866
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

clover, which is visited by humble-bees alone; so that whole fields of the red clover offer in vain an abundant supply of precious nectar to the hive-bee. 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,
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. 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,
in
by
the continued preservation of individuals presenting mutual and slightly favourable deviations of structure.
I am well aware that this doctrine of natural selection, exemplified in the above imaginary instances, is open to the same objections which were
at
at
first urged against Sir Charles Lyell's noble views on "the modern changes of the earth, as illustrative of geology;" but we now
very
very
seldom hear the action, for instance, of the coast-waves, called a trifling and insignificant cause, when applied to the excavation of
the deepest
gigantic
valleys or
to
to
the formation of
long
the longest
lines of inland cliffs. Natural selection
can
can
acts
act
only by the preservation and accumulation of
infinitesimally
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