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Petty, William, Sir, 1623-1687

"Essays on Mankind and Political Arithmetic"



The Second Way.

I found that the years 1684 and 1685, being next each other, and
both healthful, did wonderfully agree in their burials, viz., 1684
they were 23,202, and A.D. 1685 23,222, the medium whereof is
23,212; moreover that the christenings 1684 were 14,702, and those
A.D. 1685 were 14,730, wherefore I multiplied the medium of burials
23,212 by 30, supposing that one dies out of 30 at London, which
made the number of people 696,360 souls.
Now to prove that one dies out of 30 at London or thereabouts, I say
-
1. That Grant in the --- page of his fifth edition, affirmeth from
observation, that 3 died of 88 per annum which is near the same
proportion.
2. I found that out of healthful places, and out of adult persons,
there dies much fewer, as but one out of 50 among our parliament
men, and that the kings of England having reigned 24 years one with
another, probably lived above 30 years each.
3. Grant, page --- hath shown that but about one of 20 die per
annum out of young children under 10 years old, and Monsieur Auzout
thinks that but 1 of 40 die at Rome, out of the greater proportion
of adult persons there, wherefore we still stick as a medium to the
number 30.
4. In nine country parishes lying in several parts of England, I
find that but one of 37 hath died per annum, or 311 out of 11,507,
wherefore till I see another round number, grounded upon many
observations, nearer than 30, I hope to have done pretty well in
multiplying our burials by 30 to find the number of the people, the
product being 696,360, and what we find by the families they are
695,076, as aforesaid.


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