Darwin Online
Publications
Manuscripts
Biography
Media
About Us
Advanced search

See page in:
1859
1860
1861
1866
1869
1872

Compare with:
1859
1860
1861
1866
1872

→ that changed conditions act in two ways, directly on the whole organization or on certain parts alone, and indirectly through 1869
the truth of the remark— that 1859 1860 1861
the truth of the remark — that 1866
that changed conditions act in two ways, directly on the whole organisation or on certain parts alone, and indirectly through 1872
↑ 5 blocks not present in 1869 1872; present in 1859 1860 1861 1866
The male and female sexual elements seem to be affected before that union takes place which is to form a new being. In the case of "sporting" plants, the bud, which in its earliest condition does not apparently differ essentially from an ovule, is alone affected. But why, because the reproductive system is disturbed, this or that part should vary more or less, we are profoundly ignorant. Nevertheless, we can here and there dimly catch a faint ray of light, and we may feel sure that there must be some cause for each deviation of structure, however slight. How much direct effect difference of climate, food, &c., produces on any being is extremely doubtful.
→ to be the case by any 1869
by 1872
↑ 1 blocks not present in 1869 1872; present in 1859 1860 1861 1866
My impression is, that the effect is extremely small in the case of animals, but perhaps rather more in that of plants.
→ But we may 1869
We may, at least, 1859 1860 1861 1866
→ the innumerable 1869
such influences cannot have produced the many striking and 1859 1860 1861 1866
→ OMIT 1869
between one organic being and another, 1859 1860 1861 1866
→ nature between various organic beings, cannot be attributed simply to such action. 1869
nature. 1859 1860 1861 1866
→ In the following cases the conditions seem to have produced some slight definite effect: 1869 1872
Some little influence may be attributed to climate, food, &c.: thus, 1859 1860 1861 1866
→ are 1859 1860 1869 1872
vary and become 1861 1866
→ a greater depth; but these statements have lately been disputed. 1869
greater depths. 1859 1860 1861 1866
a greater depth; but this certainly does not always hold good. 1872
→ on islands or near the coast; and Wollaston is convinced that residence near the sea affects the colours of insects. 1869
on islands or near the coast. 1859 1860 1861
on islands or near the coast. So with insects: Wollaston is convinced that residence near the sea affects their colours. 1866
near the coast or on islands; and Wollaston is convinced that residence near the sea affects the colours of insects. 1872
→ Moquin-Tandon gives a list of plants which when growing near the sea-shore have their leaves in some degree fleshy, though not elsewhere fleshy. 1859 1860 1861 1869
Several other such cases could be given. 1866
Moquin-Tandon gives a list of plants which, when growing near the sea-shore, have their leaves in some degree fleshy, though not elsewhere fleshy. 1872
to show →that changed conditions act in two ways, directly on the whole organization or on certain parts alone, and indirectly through the reproductive
system
system.
is
....
eminently
....
susceptible
....
to
....
changes
....
in
....
the
....
conditions
....
of
....
life;
....
and
....
to
....
this
....
system
....
being
....
functionally
....
disturbed
....
in
....
the
....
parents,
....
I
....
chiefly
....
attribute
....
the
....
varying
....
or
....
plastic
....
condition
....
of
....
the
....
offspring.
....
In all cases there are two factors, the nature of the organism, which is much the most important of the two, and the nature of the conditions. The direct action of changed conditions leads to definite or indefinite results. In the latter case the organisation seems to become plastic, and we have much fluctuating variability. In the former case the nature of the organism is such that it yields readily, when subjected to certain conditions, and all, or nearly all the individuals become modified in the same way. ↑
It is very difficult to decide how far changed conditions, such as of climate, food, &c., have acted in a definite manner. There is
some
some
reason to believe that in the course of time the effects have been greater than can be proved →to be the case by any clear evidence. ↑ →But we may safely conclude that →the innumerable complex
coadaptations
co-adaptations
of structure →OMIT which we see
everywhere
....
throughout →nature between various organic beings, cannot be attributed simply to such action. →In the following cases the conditions seem to have produced some slight definite effect: E. Forbes
speaks confidently
asserts
that shells at their southern limit, and when living in shallow water, →are more brightly coloured than those of the same species
further
from further
north or from →a greater depth; but these statements have lately been disputed.
Gould
Mr. Gould
believes that birds of the same species are more brightly coloured under a clear atmosphere,
that
than
when living →on islands or near the coast; and Wollaston is convinced that residence near the sea affects the colours of insects. →Moquin-Tandon gives a list of plants which when growing near the sea-shore have their leaves in some degree fleshy, though not elsewhere fleshy.
Several
....
other
Other
such cases
similar facts
could be given.
The fact of varieties of one species, when they range