780 Mr. hutton’s Calculations to af certain 
131284080 feet for the whole circumference, which 
are equal to 24864-'- miles, making 6 g~ to a degreeein 
the mean latitude. Laftly, \ of 131284080 give 
87522720 for the meafure of the attraction of the 
whole earth. 
Confequently, the whole attraction of the earth is to 
the fum of the two contrary attractions of the hill, as the 
number 87522720 to 881 1}, that is, as 9933 to 1 very 
nearly, on fuppofition that the denfity of the matter in 
the hill is equal to the mean denfity of that in the whole 
earth. 
But the Aftronomer Royal found, by his obfervations, 
that the fum of the deviations of the plumb line, pro- 
duced by the two contrary attractions, was 1 1*6 feconds.. 
lFrom hence it is to be inferred, that the attraction of the 
earth is actually to the fum of the attractions of the hill, 
nearly as radius to the tangent of 1 1*6 feconds, that is, 
as 1 to ’000056239, or as 17781 to 1; or as 1780410 1 
nearly, after allowing for the centrifugal force arifing 
from the rotation of the earth about its axis. 
Having now obtained the two refults, namely, that 
which arifes from the aCtual obfervations, and that be- 
longing to the computation on the fuppofition of an 
equal denfity in the two bodies, the two proportions com- 
pared muft give the ratio of their denfities, which is 
6 that 
