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is these boulders there are innumerable scratchings, plou 
|s, traversing our country in systems ; the scratches and gro< 
Item are always parallel. Systems sometimes cross each other 
lision of scratchings and groovings. And the surface of the 
s| planed perfectly smooth. 
1| :: question respecting the power which transported these be 
H (grooved, -and striated the rocks, (it has been the unquestioned 
spied for an enlightened opinion upon the subject, that the 
taphenomena are owing to the same great cause) has ever b 
d is still an unsettled one. It has been suggested that tl 
o © swept down from higher latitudes by the impetuosity of 
I | transportation of these immense masses of rock in t 
o o € l ^P lanm gs and groovings mentioned. It being difficult 
P Q H ll ^ sufficient force to transport a mass of granite weighing 1 
rg | lon ? smce been abandoned. But granting tha 
g in a given current or torrent to transport said boi 
m i, ^ a cause adequate to the production of the pla 
g.^hing, grooving, and stnation spoken of; for, though the 
f J|y * plane ; P lou g h > and groove the underlying rocks, in 
O J be nod ? lng to retain these masses of rock in a uniform j 
■ i !r lngS and groovings, instead of presenting the 
g Jt ; 7 , be entlrely devoid of system or symmetry. 
■ tjeen demonstrated to be utterly impossible for. the 
! ater al0ne, a theor y known as the 4 4 icebc 
Itieirp a - 1S the ° ry supposes that these erratics were froz 
idem rl ^ mt 1 ° southern regions, melting, dropped thenr 
koennn !! g ^* ossMi iy of transporting the rocks in thi 
tere driven ah ° f 1S n0t accounted for i because frozen 
out at random by the currents, or by the winds, th 
