ae Scientific Intelligence. 
‘work done and the force speed. will hold, as if the effect had been 
produced by any other mechanic al power :—-whether the waves be one 
or many, great or small. And as the amount of the work done in trans- 
porting the northern drift from its parent rocks (supposing their place 
known) to its present position, may be caiculated upon assumed numer- 
Si > 
but the result pre soaul can easily be Lerncy Ay changing it i ny 
proportion ie Soh ee which ought to be made in any of the nu- | % 
merical elem ; : 
pl view, suppose the area to be circular, Smith a radius of 800 miles ; ; 
therefore make the basis of calculation. 
Within the circle of 800 m iles 0 200 500 y Hog 
each mile, a patch of drift, one-tenth of a mile square and one foot ~ 
deep ; or a ridge or “trainée” of drift, one-tenth of a mile long, one~ 
hundredth of a mile broad, and. ten feet eep. It is easy to see that — 
the supposition might be put in innumerable other forms; and by come"q: 
paring these wi iy many observed facts, some average result might eee 
haps be obta i ba 
Supposing ‘is result to be, as I have said, that on every mile’ there " 
is an average depth of one hundredth of a foot, I pe for the sake of : 
re calculation, call this syy'5a5 of a mile (instea saesou) And md 
e of ground, at oH mean Retain fromthe ori- 
a cubic mile of dri 
7 $ are immersed 
piv “at of water. 
