The sun. [volume] (New York [N.Y.]) 1833-1916, 1897-01-11
rAcrs FROM Az OLD MAI.
A Remarkable showing or Topographic
Changes In Two Centuries.

IL lie we'll known that our Appalachian Noun
tains were once very much higher than the
Rocky Mountains OF to-day. and that tho reason
why they are now comparatively low mountains
is simply that they are very old and have been
worn down by denudation. The same destruc-
tive influences are still degrading them. very
slowly as we measure ordinary time. to lower
levels. We know that changes are constantly
going on in the physical condition OF the earth's
crust, but these changes are go slowly
accomplished that they can scarcely DO
observed. In many cases. In an ordinary life
time. In the coming ages. students OF pbysiog-
raphy will have a great advantage over those
OF to-day: for the art OF accurately delineatins
tho surface of the earth by means Of contoured
maps Is q comparatively recent invention.
Hundreds Of years from now the physiog-
raphers will be able to learn from the maps we
are making now exactly what the surface fea-
lures Of large .aress were In our time, and IL
will DO easy to make instructive comparisons
with tho same features as they And them.
Prof. Eduard Brnckner has recently described
in Pctermdnn's Mtteiungen the very interesting
results Of n comparative study of n remarkable
map Of the seventeenth century and one OF the
Swiss survey maps of to-day. In 1907 Mr.. j. c.
GyGer completed his map Of n part OF the Al
pine region extending from the Rhine on the
north 70 tho Reuss on the south. and including
the whole Of the canton of Zurich. in Switzcr-
lsnd.-Tbo map was on an unusually large scale
,or ,,,, Tim. Tb. ,coI. wa. lao ooo. or ono
,n., 90 81. m.n N, .ho,,, . nj, ,n,i. IN na,,,.
u.worL.d commas. In hana nac.d hi. d,.,,n ce.
GA cor.,p, and I. hor,op, IN nj. .p,v.v
n. coy. c,.,t aeoi n, tim. %, ,h,rtv...v.n
r.,r. % his man Ue m. s,,t On ma. iIyb,.
and shadows to indicate and contrast mountain
slopes. Two copies OF his man. both signed by
him. are eItaht. and they still excite the ad-
mir,,Ion y, c.r,ooronh,r. tor IN. vond.,,r,
.ccn,arv With which ,bey se,,c, ,onoer.nbr
I-n,ii ,his cen,prv ,he Gycs, mar r,. ,sg.,d.d
os tho hest cartoor,,hio s,lIns.,ion a, IN.
Zp,ich can,on. small na,,. q, q, bar. hen
rnhii.,.d w,,h co,ro.,o,dino ..c,,on. y, On.
,ra..,, .,r,.,. ~ r.. 81. IT.. .,.,,.zs
accuracy Mr. Gy,er ATTAINED
Nr n WaI..r las carried nm, q, IN. Can
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oten near"' 'hNt Europe is gradually uncer-
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t0 HA'e JUDI hpout