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1859
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1860
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it assumed 1859 1860 1861 1866
whilst young it possessed 1869 1872

there is some evidence to render it probable, that 1859 1860 1861
there is a large body of facts rendering it probable, that 1866
OMIT 1869 1872

horns of almost full-grown 1859 1860 1861 1866
full-grown horns of 1869 1872

cattle. 1859 1860 1866 1869 1872
cattle. But further than this, variations which, for all that we can see, might have appeared earlier or later in life, tend to appear at a corresponding age in the offspring and parent. 1861

But further than this, 1859 1860 1866
I am far from meaning that this 1861
But 1869 1872

variations which, for all that we can see, might have appeared earlier or later in life, tend to appear at a corresponding age 1859 1860 1866
is invariably the case; and I could give a good many cases of variations (taking the word 1861
variations, which, for all that we can see might have appeared either earlier or later in life, likewise tend to appear at a corresponding age 1869
variations, which, for all that we can see might have first appeared either earlier or later in life, likewise tend to re-appear at a corresponding age 1872

offspring and 1859 1860 1866 1869 1872
largest sense) which have supervened at an earlier age in the child than in the 1861

a good many 1859 1860 1866
several exceptional 1869 1872

if their truth be admitted, will, 1859 1860 1861 1866
namely, that slight variations generally appear at a not very early period of life, and are inherited at a corresponding not early period, explain, as 1869 1872

and have probably 1859 1860 1861 1866
varieties, 1869 1872

acquired a little earlier or later in life. It would not signify, for instance, to a bird which obtained its food
best
best
by having a
much-curved
long
beak
beak,
whether or not it assumed a beak of this
shape,
particular length,
as long as it was fed by its parents. Hence, I conclude, that it is quite possible, that each of the many successive modifications, by which each species has acquired its present structure, may have supervened at a not very early period of life; and some direct evidence from our domestic animals supports this view. But in other cases it is quite possible that each successive modification, or most of them, may have appeared at an extremely early period.
I have stated in the first chapter, that there is some evidence to render it probable, that at whatever age
a
any
variation first appears in the parent, it tends to
re-appear
reappear
at a corresponding age in the offspring. Certain variations can only appear at corresponding
ages;
ages,
for instance, peculiarities in the caterpillar, cocoon, or imago states of the
silk-moth:
silk-moth;
or, again, in the horns of almost full-grown cattle. But further than this, variations which, for all that we can see, might have appeared earlier or later in life, tend to appear at a corresponding age in the offspring and parent. I am far from meaning that this is invariably the
case,
case;
and I could give a good many cases of variations (taking the word in the largest sense) which have supervened at an earlier age in the child than in the parent.
These two principles, if their truth be admitted, will, I believe,
explain
explain
all the above specified leading facts in embryology. But first let us look
to
at
a few analogous cases in
our domestic
domestic
varieties. Some authors who have written on Dogs, maintain that the greyhound and
bull-dog,
bulldog,
though
appearing
appearing
so different, are really
varieties
varieties most
varieties most
closely
allied
allied,
and have probably descended from