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the living muft be 7263. The dead in the inter- 
mediate years at London may likewife be found, by 
means of Dr. Halley’s table. For, by proportion, if 
the dead at Breilau from the age of 10 to 20 com- 
plete be 61, and in the 20th year 6, and the dead 
at London for the fame period be 74.1 ; then will the 
dead in the 20th year be 73. And therefore if the 
living at London, in the 20th year of their age, be 
found to be 7263 ; this muft be equal to the num- 
ber of births, having fubtrafted from them all the 
dead in each of the preceding nineteen years. And 
confeqiiently if we put x for the number of births, 
we Ihail have this limple equation, 
A* — 8819 — 2006 . — 805 — 7+1 73 = 7263 ; 
and thence the number of births a == jg^bi. And 
the fame number would have been produced from 
any intermediate age, between i 2 and 20^ So that 
if we could be certain of the number of the dead, 
there could be no doubt but, that 19561 would nearly 
at an average for ten years, be the whole of the 
births yearly. And this is greater than the number 
of baptifms known 14626, taken likewife at a me- 
dium, for the fame ten years, from 1743 to I75’3 in- 
clufive, by the number 493 y. 
From which, by the Way, we may fee, as this 
difference between the births and baptifms muft 
be occafioned by diffenters, that the number of 
fuch of all denominations, both proteftant and po- 
pifh, with the Jews, do not make above one-fourth 
of the whole of the people within the bills of mor- 
tality; and confeqiiently that the proteftant dilfent- 
ers, exclulive of Qiiakers and Jews, are not above 
an eight part of the whole. And we may alfo ob- 
ferve, that as the difference between the births 
A a 2 19561, 
