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1859
1860
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OMIT 1869 1872
and likewise a close similarity in the embryos of widely different animals within the same class, 1859 1860
and like-wise a close similarity in the embryos of widely different animals within the same class, 1861
and like-wise a close similarity in the embryos of different animals within the same class, 1866

are tempted 1869 1872
might be led 1859 1860 1861 1866

this difference as in some manner 1869
these facts as necessarily contingent in some manner 1859 1860 1861
these facts as in some manner necessarily contingent 1866
this difference as in some necessary manner contingent 1872

necessarily contingent on 1869
on 1859 1860 1861 1866 1872

2 blocks not present in 1859 1860 1861 1866 1869; present in 1872
In some whole groups of animals and in certain members of other groups this is the case, and the embryo does not at any period differ widely from the adult: thus Owen has remarked in regard to cuttlefish, "there is no metamorphosis; the cephalopodic character is manifested long before the parts of the embryo are completed." Land-shells and fresh-water crustaceans are born having their proper forms, whilst the marine members of the same two great classes pass through considerable and often great changes during their development.

this is the case, and the 1869
the 1859 1860 1861 1866

changes during their development. 1869
changes. 1866

The larvæ of most insects pass through a worm-like stage, whether they are active and 1869 1872
The larvæ of insects, whether 1859 1860 1861
With almost all insects, the larvæ, whether 1866

diversified 1869 1872
the most diverse and active 1859 1860 1861
diversified and active 1866

from being placed in the midst of proper nutriment 1869 1872
being fed by their parents or placed in the midst of proper nutriment, 1859 1860 1861
being placed in the midst of proper nutriment or fed by their parents, 1866

or from being fed by their parents; 1869 1872
yet nearly all pass through a similar worm-like stage of development; 1859 1860 1861 1866

of the development of this insect, by Professor Huxley, 1869 1872
by Professor Huxley of the development of this insect, 1859 1860 1861 1866

and very
and very
simple eye-spot. In this last and complete state, cirripedes may be considered as either more highly or more lowly organised than they were in the larval condition. But in some genera the larvæ become developed
either
either
into hermaphrodites having the ordinary structure,
and
or
into what I have called complemental
males:
males;
males,
and in the
latter
latter,
the development has assuredly been
retrograde,
retrograde;
for the male is a mere sack, which lives for a short
time
time,
and is destitute of mouth, stomach,
and every
or
other
organ
organs
of importance, excepting
for
those for
reproduction.
We are so much accustomed to see
differences
a difference
in structure between the embryo and the adult, OMIT that we are tempted to look at this difference as in some manner necessarily contingent on growth. But there is no
obvious
....
reason why, for instance, the
wing
wings
of a bat, or the
fin
fins
of a porpoise, should not have been sketched out with all
the
their
parts in proper proportion, as soon as any
part
structure
became
visible
visible.
in
....
the
....
embryo.
....
And in
In
some whole groups of animals and in certain members of other
groups,
groups
this is the case, and the embryo does not at any period differ widely from the adult: thus Owen has remarked in regard to cuttle-fish, "there is no metamorphosis; the cephalopodic character is manifested long before the parts of the embryo are
completed;"
completed."
and
....
again
....
in
....
spiders,
....
"there
....
is
....
nothing
....
worthy
....
to
....
be
....
called
....
a
....
metamorphosis."
....
Land-shells and fresh-water crustaceans are born
with
having
their proper
forms,
form,
whilst the marine members of
these
the same
two great classes pass through considerable and often great
developmental
....
changes during their development. Spiders, again, barely undergo any metamorphosis. The larvæ of most insects pass through a worm-like stage, whether they are active and adapted to diversified habits, or
quite
remaining
are
inactive,
inactive
from being placed in the midst of proper nutriment or from being fed by their parents; but in some few cases, as in that of Aphis, if we look to the admirable drawings of the development of this insect, by Professor Huxley,