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Petty, William, Sir, 1623-1687

"Essays on Mankind and Political Arithmetic"


400 1,400 32,000,000 about David's time.
550 1,950 64,000,000
750 2,700 128,000,000 about the birth of
Christ.
1,000 3,700 256,000,000
300 {
In { 4,000 320,000,000
1,200 {

It is here to be noted, that in this table we have assigned a
different number of years for the time of doubling the people in the
several ages of the world, and might have done the same for the
several countries of the world, and therefore the said several
periods assigned to the whole world in the lump may well enough
consist with the 360 years especially assigned to England, between
this day and the Norman Conquest; and the said 360 years may well
enough serve for a supposition between this time and that of the
world's being fully peopled; nor do we lay any stress upon one or
the other in this disquisition concerning the growth of the city of
London.
We have spoken of the growth of London, with the measures and
periods thereof; we come next to the causes and consequences of the
same.
The causes of its growth from 1642 to 1682 may be said to have been
as follows, viz.:- From 1642 to 1650, that men came out of the
country to London, to shelter themselves from the outrages of the
Civil Wars during that time; from 1650 to 1660, the royal party came
to London for their more private and inexpensive living; from 1660
to 1670, the king's friends and party came to receive his favours
after his happy restoration; from 1670 to 1680, the frequency of
plots and parliaments might bring extraordinary numbers to the city;
but what reasons to assign for the like increase from 1604 to 1642 I
know not, unless I should pick out some remarkable accident
happening in each part of the said period, and make that to be the
cause of this increase (as vulgar people make the cause of every
man's sickness to be what he did last eat), wherefore, rather than
so to say quidlibet de quolibet, I had rather quit even what I have
above said to be the cause of London's increase from 1642 to 1682,
and put the whole upon some natural and spontaneous benefits and
advantages that men find by living in great more than in small
societies, and shall therefore seek for the antecedent causes of
this growth in the consequences of the like, considered in greater
characters and proportions.


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