166
,
OF FISHES
sh0uld-develop to agreater-extent Under conditions producing
'
a greater variety of colours, as in the tropics and inshOre - ;
areas.
It is the law of action and reaction in the organic .
world Which we have already seen exemplied in the
skeleton.
The dents or impressions from without lead
to a change in the tissues, which is at rst non—utilitarian,
-}Î
but gradually becomes responsive only to particular impressions when constantly renewed. The absence of these
f_,î_î
impressions, as in the case of the oshore shes under
“:
more uniform cdnditions of light, means that the apparatus ,
…Ï
remains undeveloped. :
'
,
'
'
fÏ=
_
—
The question Whether colours are adaptations for the
sake of, protection, and have been evolved through and
for this
will be referred to later; but the
_'Ï_Ï:
opinionbeordan andaSealewith regard to the _brilliantly
7
;ÿ-;î
coloured
the coral reefs may just be quoted here :
Î
Ï‘ It is,ot eàsyt0 explain—the reason for these vivid hues, nor
=;
_
for the élaboraté and striking marldngs which acco'mpany
*'ÏZ'Ë
them._ .”
is clear that protective coloration is needless, for
these species are exceedingly active
,
and when ,disturbed
”
"__;_ŸÏ;
Ï
throughthe Water like animated lightinig'——ahd;the
'
'.
idea thàtrecogni‘thn has a high value to the species has
_.
never been: receiVed With faveur by
.
»
'
:
_
The eyes of shes have
among_
'
,
the Teleosts haVe a
_
,
is known—as the dp1dfmtgttm
considerable
of fat IntheMackerel“1teXtends
7
,
a1mostent1relyovertheeyeballleawngenlya @häïfÔW slit
-
of
::
Ï serv1cetothesesmftlymov1ngshæi1'1 presenting a smooth
surfcetothewatrbutthegn
structure can
5113
î
Pr0bablybel‘efërredbaclä tôthe lymph sac which lies above:
theskullmthelarva 1whenrthe boues are being formed; —
f_,_
'
theadipose;membrane extends round the
-Ï
;
0Vè_r—Îhehêad and,çven —aboVe_the
—
the distribution,off—‘_‘fbone_î’:in
=
Asomewhat_sirilértstructure
found in the ,sha
Lim
:i:1£fiiforms-aa.
,
OF FISHES
sh0uld-develop to agreater-extent Under conditions producing
'
a greater variety of colours, as in the tropics and inshOre - ;
areas.
It is the law of action and reaction in the organic .
world Which we have already seen exemplied in the
skeleton.
The dents or impressions from without lead
to a change in the tissues, which is at rst non—utilitarian,
-}Î
but gradually becomes responsive only to particular impressions when constantly renewed. The absence of these
f_,î_î
impressions, as in the case of the oshore shes under
“:
more uniform cdnditions of light, means that the apparatus ,
…Ï
remains undeveloped. :
'
,
'
'
fÏ=
_
—
The question Whether colours are adaptations for the
sake of, protection, and have been evolved through and
for this
will be referred to later; but the
_'Ï_Ï:
opinionbeordan andaSealewith regard to the _brilliantly
7
;ÿ-;î
coloured
the coral reefs may just be quoted here :
Î
Ï‘ It is,ot eàsyt0 explain—the reason for these vivid hues, nor
=;
_
for the élaboraté and striking marldngs which acco'mpany
*'ÏZ'Ë
them._ .”
is clear that protective coloration is needless, for
these species are exceedingly active
,
and when ,disturbed
”
"__;_ŸÏ;
Ï
throughthe Water like animated lightinig'——ahd;the
'
'.
idea thàtrecogni‘thn has a high value to the species has
_.
never been: receiVed With faveur by
.
»
'
:
_
The eyes of shes have
among_
'
,
the Teleosts haVe a
_
,
is known—as the dp1dfmtgttm
considerable
of fat IntheMackerel“1teXtends
7
,
a1mostent1relyovertheeyeballleawngenlya @häïfÔW slit
-
of
::
Ï serv1cetothesesmftlymov1ngshæi1'1 presenting a smooth
surfcetothewatrbutthegn
structure can
5113
î
Pr0bablybel‘efërredbaclä tôthe lymph sac which lies above:
theskullmthelarva 1whenrthe boues are being formed; —
f_,_
'
theadipose;membrane extends round the
-Ï
;
0Vè_r—Îhehêad and,çven —aboVe_the
—
the distribution,off—‘_‘fbone_î’:in
=
Asomewhat_sirilértstructure
found in the ,sha
Lim
:i:1£fiiforms-aa.