Pausaes 1:2 and Geology. 7 
on which it rests, tenets? on the form e body, its saga er that 
of the surface, and other ceumsiances = saa I think we uppose 
that it would require a force and pressure of at least ad ek the 
weight of the mass Mathes to Neal Tooke and loose materials along 
the bottom of the : 
This being Bi it Swill require a force (pressure) equal to the 
weight ba half a cubic foot of water to move a cubic foot of drift ; ; and 
so, for ‘other quantities. And f move sygg00 Of a cubic mile o 
drift, will” require the weight of z55}00 Of a mi ile of water, acting as” 
a pressure. 
Now this mass of drift, which is found on an average mile at the mean 
distance, has travelled 500 miles from the centre. And the laboring 
force whi ch has carried it through this space, in whatever way it has 
acted, must be equivalent to the product of the moving pressure and the 
space through sepion it has acted ; that is, it must ‘be rs {sda to the 
weight of 1900000 of a mile of water, multiplied into 500 miles 
is is the water, multiplied into one > mile ; ; 
ati mn. 
"That ne cubic mile of water rising through 5755 of a mile (or 
; ‘sank - feat) would supply the power necessary to carry the ‘dr ift 
which Hom axe one average mile at the mean distance from the centre 
‘of distribution 
1 sages of one cubic mile of wat ter, we may take a square of ten 
miles, ;}5 of a mile deep; and this mass rising through 5,4; of a mile, 
- will produce the effect now spoken of. 
Taking any radius drawn from the centre of the annulus, the part of 
this radius which lies on the annulus is 600 miles. On each of these 
: 600 miles, we suppose drift to rest. Each portion of drift ‘et travelled 
.. diferent distance fromthe centre. But at each different distance from 
the centre, there may be a different ay of drift upon the average ; 
; ae aetsivs probably decreasing as we recede from the centre. Let us 
suppose, for the sake of badesdation: ‘has the quantity diminishes exactly 
in roportion as the distance increases; so that at the distance of 200 
eo a aan the quantities ona square mile are as four and one re- 
PO nid supposition, the laboring the requisite to ey the drift 
‘salen. lies on each square mile of “the same: radial lin , would be the 
same. It would take the same ‘Saboring force to sash TpvoT0 of a 
— through 500 miles (the mean radius), as to carry qZoopes through © | 
200 miles to the inner edge of the annular space; or y-5}eg5. through 
800 miles to oe outer edge ofthe annulus. In each case e, the amount 
A "oF force requ’ 
wate 
raised ‘rough one m 
Here the laboring lies tekibtice to carry the drift to the whole ee 
1e 600 mil vhich lie along this radius, would be e 38; 0 te 2 
water eee one inile (600 Xs2,5=25= =75)- 
whole sa siless ae tength of the 
ae 8, is about 1500 
cal tracts a 
would be, as before, the weight of 3355 af a mile of: . ‘es 
