[ 2?S ] 
fures of Meflieurs Picard and Caflini, i23j24p,doa 
Paris, feet, or 131,630,572 Englifh feet, which* is 
24930 Englifh miles ; and the diameter.is 7935 Eng- 
lilh miles. And then the whole furface of the globe, 
by Prop,. 38. lib. i. .-Archtm. de Sphcera & Cylmdro^ 
is 24930 X 7935= 197,8 1 9, 5- fo fquare miles. And 
as the whole furface is to the quantity of land, near 
about 8 to 3, the land will then be 74,182,331 fquare 
miles ; of which, if we allow one-third to be wafte 
ground, or unfit to produce the neceflaries of life, 
we fhall have 49,45'4, 887 fquare miles, or 49,454,887 
X 640 = 31,651,127,680 good acres. Now the num- 
ber of mankind ovef the whole globe is computed by 
Sir W. Petty, and others, to be under 350,000,000; 
but we, will fuppofe them 400,000,000, which is 
furely.more than their number, .that we may* avoid 
any uncertainty in computation ; and then there will 
be 79 good acres to each perfon. * From which it is 
evident, if the foil in England be confidered as a 
medium between the poor lands in the northern Cli- 
mates, and the very fertile in the fouthern, and three 
acres be here fufficient for one perfon, that the earth 
can maintain more than twenty-fix times its prefent 
number of inhabitants. And if we imagine the land 
to be in a greater proportion to the furface than 3 to 
8, and the number of mankind lefs than we have 
fuppofed, the produce of the earth will then be in 
a greater proportion to them. And hence it plainly 
appears, that the earth is in a very imperfed: hate 
with regard to the number of people. And that if 
births and burials are fuppofed nearly in the fame pro- 
portion, all over the Globe as in England, it will be 
above 1000 years before die earth can be fully 
peopled. 
