'
THE»GENEÀLOGŸ OF FÏSHES
219 _»
_
Waterways leads—to a brief consideration of the views held
'
by geologist$ regarding {these
F ormerlÿ; .indeeduntil quite ,recentlÿ, it was generally believed;that the
continents: had always been in the
as they are
noW.
If;1and—bridges existed
simply disappeared_ under the
,
_
lies under the waters of the North AtlætiaQ;Wh$t ongtheÿ ,
_
other hand'the moon has been torn'
the
1
Pacic. The face of the Earth assumed its
,
"
.
,
anée from the gradual shrinlngiof its Components
'
became
mount—ame, were throwüp ., - '
bÿ__vi01etÈeruptionsjand the
; had riSen and
'
the
o£ .
‘
’
'
theory of the Earth’schanges is no longer
,
'
'
,
held so rmly, and a neW interpretation of the ancientl—and'
;
bridges has arisen. The land-masses are not so solid1y,
a
'rooted as was
supposed.
'
'
measurementsmade in
the
"
j ,
the _Danish— observer ,Koch;has,Îdeteote'dçaÏmoÿementiof that
,
;%Eufopç,,
,
'
*
,
FaeroeIslesrelatweto :îonéÏ another has‘ïbeen notédhÿ:the1
:“
? sameobserver
seems thattheLabradùt coast— !
,_:{Î
?
'
,
and- a swinging 1Ï10ver‘nent tif,the NorthAmerrcancontrnent
'
southwards, notiœd : in recent_'
:,
'
“also to be taking place; In Europe; again,'.a comparison—of"
'_
various readings from eariier and later years points- to av
,
"'southward movement of that continent, though this maybe
,
l
'
'
shifting of the North Pole towards the other side. i
Theseobservatrons are in keeping With the view, noW, an ‘_
î
acceptedhehef, that the crust of the Earth,
j_'î
about
on a plastic magma(barysphere), , —
whiÇh,
have a greater resœtancethansteel,
"-’*' _'
acts like
theenorm0üs
_
preSSures
'.
:
that thefmagma-àppr0adms: :eàfÿeî t0thesurfaœaïsome
;:
Î _}
places ,* under the
than
Ï_'ïÎ'