Darwin Online
Publications
Manuscripts
Biography
Media
About Us
Advanced search

See page in:
1859
1860
1861
1866
1869
1872

Compare with:
1859
1861
1866
1869
1872

→ there 1859 1860 1861 1866
the character in question 1869 1872
→ a tendency to reproduce the character in question, which 1859 1860 1861 1866
lying latent, and 1869 1872
→ gains an ascendancy. 1859 1860 1861
gains an ascendency. 1866
is developed. 1869 1872
→ For instance, it is probable that in each generation of 1859 1860 1861 1866
With 1869 1872
→ which produces most rarely 1859 1860 1861 1866
for instance, which very rarely produces 1869 1872
→ and black-barred bird, there has been a tendency 1859 1860 1861 1866
bird, it is probable that a latent tendency exists 1869
bird, it is probable that there is a latent tendency 1872
→ in the plumage to assume this colour. 1859 1860 1861 1866
to produce blue plumage. 1869 1872
↑ 3 blocks not present in 1859 1860 1861 1866 1872; present in 1869
The possibility of characters long lying latent can be understood according to the hypothesis of pangenesis, which I have given in another work. The abstract improbability of a latent tendency being transmitted through a vast number of generations, is not greater than than of quite useless or rudimentary organs being thus transmitted. A mere tendency to produce a rudiment is indeed sometimes inherited.
→ This view is hypothetical, but could be supported by some facts; and I can see no more 1859 1860 1861 1866
The 1872
→ to produce any character being inherited for an endless 1859 1860 1861 1866
being transmitted through a vast 1872
→ than in 1859 1860 1861 1866
is not greater than that of 1872
→ as we all know them to be, thus inherited. 1859 1860 1861 1866
similarly transmitted. 1872
→ Indeed, we may sometimes observe a 1859 1860 1861
Indeed, we may sometimes observe that a 1866
A 1872
→ inherited: for instance, in the common snap-dragon (Antirrhinum) a rudiment of a fifth stamen so often appears, that this plant must have an inherited tendency to produce it. 1860
inherited: for instance, in the common snapdragon (Antirrhinum) a rudiment of a fifth stamen so often appears, that this plant must have an inherited tendency to produce it. 1859 1861
is inherited. 1866
is indeed sometimes thus inherited. 1872
→ on my theory, to have 1859 1860 1861 1866
on our theory, to be 1869
to be 1872
→ a variety of one 1859 1860 1861
the varieties of two or more 1866 1869 1872
→ in some of its 1859 1860 1861
each other, or that a variety of one species would resemble in some of its 1866
each other, or that a variety of some one species would resemble in certain 1869
each other, or that a variety of one species would resemble in certain 1872
→ species; 1859 1860 1861
and distinct species, — 1866 1869
and distinct species,— 1872
→ on my 1859 1860 1861 1866
according to our 1869 1872
→ thus gained 1859 1860 1861 1866 1869
exclu- sively due to analogous variation 1872
→ be governed by 1859 1860 1861 1866 1869
have been determined through 1872
→ a similar inherited constitution. 1859 1860 1861 1866
OMIT 1872
the conditions of life. 1869
→ lost ancestral 1859 1860 1861 1866
long lost ancestral 1869
long lost 1872
→ exact character of the 1859 1860 1861 1866 1869
OMIT 1872
→ could not distinguish these two cases: if, 1859 1860 1861 1866 1869
cannot distinguish between reversionary and analogous characters. If, 1872
distant,
distant,
but that in each successive generation →there has been →a tendency to reproduce the character in question, which at last, under unknown favourable conditions, →gains an ascendancy. →For instance, it is probable that in each generation of the barb-pigeon, →which produces most rarely a blue →and black-barred bird, there has been a tendency in each generation →in the plumage to assume this colour. ↑ →This view is hypothetical, but could be supported by some facts; and I can see no more abstract improbability
of such
in
a tendency →to produce any character being inherited for an endless number of generations, →than in quite useless or rudimentary organs
being
being,
→as we all know them to be, thus inherited. →Indeed, we may sometimes observe a mere tendency to produce a rudiment →inherited: for instance, in the common snap-dragon (Antirrhinum) a rudiment of a fifth stamen so often appears, that this plant must have an inherited tendency to produce it.
As all the species of the same genus are
supposed
supposed,
→on my theory, to have descended from a common
progenitor,
parent,
it might be expected that they would occasionally vary in an analogous manner; so that →a variety of one species would resemble →in some of its characters another →species; this other species
being,
being
→on my
view,
view
only a well-marked and permanent variety. But characters →thus gained would probably be of an unimportant nature, for the
preservation
presence
of all
functionally important
important
characters will →be governed by natural selection, in accordance with the
different
diverse
habits of the
species.
species,
and
and
will
will
not
not
be
be
left
left
to
to
the
the
mutual
mutual
action
action
of
of
the
the
nature
conditions
conditions
of
of
the organism
life
life
and
and
of
of
→a similar inherited constitution. It might further be expected that the species of the same genus would occasionally exhibit reversions to →lost ancestral characters. As, however, we
do not
never
know the →exact character of the common ancestor of
any natural
a
natural group,
group,
we →could not distinguish these two cases: if,