Royal Society. 37 
arms, vvliich are thofe between 1 8 and 5^, rather then 16 and do 5 
the one being generally too weak to bear the fatigues of war, and 
the weight of arms, and the others too decrepit and infirm by age, 
notwithilanding particular inftances to the contrary ; By the table 
there are found in this city 11997 perfons under 18, and 3950 a- 
bove <^6y which together make 15947, fo that the remainder to 
54000 being 18055 are perfons between thoie ages 3 at leafl: one 
half are males, or 9027, fo that the whole numter, this city can 
raile, o^ Fencible Men, as the Scofs call them, is about 9000, or 
f4, or fomewhat more than a quarter of the number of Ibulsj 
which may perhaps pals for a rule in all other places. 
The fecond ule of this table is to /liew the different degrees 
of mortality, or rather vitality in all ages j for if the number of 
perlbns of any age, remaining after one year, be divided by the 
difference between that and the number of the age propofed, it 
fhews the odds there is, that a peribn of that age does not die in 
a year 5 as for inftance a peribn of 2 5 years of age has the odds 
of 5(5'o to 7, or 8a to i, that he does not dk in a year j becaule 
that of 5<^7 living of 25 years of age, there die no more than 7 
in a year, leaving 5^0 of 26 years old j ib likewile for the odds, 
that any perfon does not die before he attain any propoled age, 
take the number of the remaining perlbns of the age propoled, 
and that fhews the odds there is between the chances of the par- 
ty's living or dying 5 as for inftance, what is the odds that a 
man of 40 lives 7 years 5 take the number of perlbns of 47 years, 
v*^hich in the table is 577, and fubftrad it from the number of 
perlbns of 40 years, which is 445, and the difference is 6*8 ; 
which Ihews that the perlbns dying in that 7 years are 6Si and 
that it is 577 to d8 or 5 i to i, that a man of 40 does live 7 
years 5 ana the like for any other number of years. 
The third ufe, if the queftion be, at what number of years it 
is an even lay that a perfon of any age fhall die, this table rea- 
dily performs it 5 for if the number of perlbns living of the age 
propofed be halved, it will be found by the table at what year 
the laid num.ber is reduced to half by mortality, and that is the 
age, to which, it is an even wager, that a peribn of the age pro- 
poled Ihall arrive before he die : As for inftance, a peribn of 5a 
years of age is propofed, the number of that age is 531, the 
half thereof is 26^, which numberis found to be between 57 and 
58 years 5 lb that a man of 50 may reafonably exped to live be- 
tween 27 and 28 years. 
Ule fourth, by what has been faid, the price of infurance upon 
lives ought to be regulated, and the difference between the price 
of 
