SWIMÂ\ŒING ANIMALS ’
93
,
the point at which they meet,? is
water full of eddies.
If the block be built i‘up'beh‘ihd with
wood of such a shape asijust to ll this eddÿigcarea, then—
it will be found
.
possible resistance in its-passage through-Ü.
'Ïï'I‘ts
form is exactly the same as the outhne tracéd fby1the water
owing
an… object and 'herice the tie‘nn
'_
_
line."
It is just this shape that cis
”most
At the same time it can be
slight variations are, required ,in
Order to
'
…
obtain the greatest efciency. f
This probably accounts- for
_
‘
the obvious diereces
outÏine
siOw}swi1miäg '
,
shes, such as the cod,
Such asthé «
'
mackerel.
A close eÈr_aminatioh ofthe_ inackerel shows that
'
hesides having this
for» high speed,
there is a smoothin g off idf all excrë“sœces
may set up
_'
The
in many
ate
'
here inset
of the
'
Very different
appearance
shes that live …a*
_
great. part ottheir time >:actuallyon“ the
'
ï
Î
of them are quite attened, so that they have a very
surface,
1ie,;andï their ns] “are so arranged‘that
by a siight appingr‘theyî can ide up
.
'
which
doWn *
on the broad
of the “sh’è hack
«
andeventuày completely—buryï it ‘frofn'
‘The“côùô
‘
.
sole .and «the
d£ ‘ at
They are
on
_
.
their sides. ;!As‘ has-been mentioned—above; -i‘h their very
-
‘
5 i
any other shes, but at
certain»stage, "When”"thevare
;'
between … half
of :an inch”: m length,a 'ÏÏj-
93
,
the point at which they meet,? is
water full of eddies.
If the block be built i‘up'beh‘ihd with
wood of such a shape asijust to ll this eddÿigcarea, then—
it will be found
.
possible resistance in its-passage through-Ü.
'Ïï'I‘ts
form is exactly the same as the outhne tracéd fby1the water
owing
an… object and 'herice the tie‘nn
'_
_
line."
It is just this shape that cis
”most
At the same time it can be
slight variations are, required ,in
Order to
'
…
obtain the greatest efciency. f
This probably accounts- for
_
‘
the obvious diereces
outÏine
siOw}swi1miäg '
,
shes, such as the cod,
Such asthé «
'
mackerel.
A close eÈr_aminatioh ofthe_ inackerel shows that
'
hesides having this
for» high speed,
there is a smoothin g off idf all excrë“sœces
may set up
_'
The
in many
ate
'
here inset
of the
'
Very different
appearance
shes that live …a*
_
great. part ottheir time >:actuallyon“ the
'
ï
Î
of them are quite attened, so that they have a very
surface,
1ie,;andï their ns] “are so arranged‘that
by a siight appingr‘theyî can ide up
.
'
which
doWn *
on the broad
of the “sh’è hack
«
andeventuày completely—buryï it ‘frofn'
‘The“côùô
‘
.
sole .and «the
d£ ‘ at
They are
on
_
.
their sides. ;!As‘ has-been mentioned—above; -i‘h their very
-
‘
5 i
any other shes, but at
certain»stage, "When”"thevare
;'
between … half
of :an inch”: m length,a 'ÏÏj-