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TABLE I. When in any country there are 103,000 persons living,

and the mortality is 1 in 36.

The proportion of the If the proportion of Then the excess of excess of the births, And therefore the pedeaths to births be as the births will be to the whole populariod of doubling will be

tion, will be

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The proportion of the

The proportion of the excess of births above Periods of doubling||excess of births above Periods of doubling in the deaths to the whole in years and ten the deaths, to the whole years, and ten thouof the living. thousandth parts. of the living.

sandth parts.

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7.2722 7.9659 8.6595 9.3530 10.0465 10.7 400 11.4333 12.1266 12.8200 13.5133 14.2066

21 22 23 24 25 26 27 28 29 30

14.9000 15.5932 16.2864 16.9797 (17.6729 18.3662 19.0594 19.7527 20.4458 21.1391

16 17 18 19 20

TABLE

TABLE II. continued

The proportion of the

The proportion of the excess of births above Periods of doubling excess of births above Periods of doubling in the deaths, to the whole in years and te the deaths, to the whole years and ten thou. of the living. thousandth parts. of the living

sandth parts.

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1:1000

693.49.

CHAP.

CHAP. XII.

Effects of Epidemics on Registers of Births, Deaths, and

Marriages.

It appears clearly from the very valuable tables of mortality, which Sussmilch has collected, and which include periods of 50 or 60 years, that all the countries of Europe are subject to periodical sickly seasons, which check their increase; and very few are exempt from those great and wasting plagues which, once or twice perhaps in a century, sweep off the third or fourth part of their inhabitants. The way in which these periods of mortality affect all the general proportions of births, deaths, and marriages, is strikingly illustrated in the tables for Prussia and Lithuania, from the year 1692 to the year 1757 .

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Sussmilch, Göttliche Ordnung, vol. i. table xxi. p. 83 of the tables.

TABLE

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10 : 42 100 : 125

In all the 64 years in 340838 1488365 (1183820 cluding the plague

1183820

More born than died

304745

The

The table, from which this is copied, contains the marriages, births and deaths for every particular year during the whole period; but to bring it into a smaller compass,

I have retained only the general average drawn from the shorter periods of five and four years, except where the numbers for the individual years presented any fact worthy of particular observation. The year 1711, immediately succeeding the great plague, is not included by Sussmilch in any general average; but he has given the ticular numbers, and if they be accurate they shew the very sudden and prodigious effect of a great mortality on the number of marriages.

Sussmilch calculates that above one third of the people was destroyed by the plague; and yet, notwithstanding this great diminution of the population, it will appear by a reference to the table, that the number of marriages in the year 1711 was very nearly double the average of the six years preceding the plague a. To produce this effect,

par

we

• The number of people before the plague, according

to

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