[ 794 ] 
under that age, only one-fifth ; and therefore the dif- 
ference being two-fifteenths, or four-thirtieths, there 
die four in thirty more at London than at Breflaw, 
under two years of age. 
In the country the cafe is very different; for there 
does not die above one in fifty, in healthy places. Sir 
William Petty has like wife obferved this, and I have 
found it true. For in the parifh of Newchurch in 
the Ifie of Wight, where 1 refided fome time, there 
are about 900 people, and there does not die, at a 
medium, above eighteen yearly ; which is one in fifty 
exadtly. And I believe this will be found to be 
nearly the fame, in moll of the counties in Britain, 
where the people do not live in great towns ; which 
fhews the great difference between the effects of the 
air, in London and the country. 
If then it be allowed, that in London and Weft- 
minfter there dies one in thirty, it will be very eafy 
to make a calculation of the whole number of 
the people nearly, that are within the bills. For if 
we take the number of burials at an average for 
fome years, and multiply that by 30, the produdt 
muff be the number of the people. Thus if we take 
the number of the burials, at large within the bills, 
for anyone of the laft ten years, at a medium, from 
1744 to 1753 inclufive, to be 22945^ and add to 
this 2000, for thofe burials omitted in the bills, as is 
fuppofed above, the total will be 24945", all the bu- 
rials within the limits of the bills, for one year at 
1753 ; and then multiply this by 30, the product 
748350 will be the whole number of the people 
nearly, at prefent. But if we take 27192, the num- 
ber of the burials, at a medium, for any one of the 
ten 
