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WILLIAMS' CASE. 237
after twenty-eight; or only one-thirtieth part, after thirty, as is
shewn by the table of Dr. Grenville. (q)
From all these various tables I have extracted so much as re-
lates to the expectation of life shewn by each, and placed it in a
separate column opposite to a column of ages, so as, in this re-
spect, to exhibit in one general table a comparative view of all of
them, together with a column shewing the number out of eight
hundred and seventy-six females, who were married at the several
ages as stated by Dr. Grenville. It should be recollected, how-
ever, that in the language of mathematicians, who treat of this
matter, the probabilities of life, and the expectation of life, are dif-
ferent. By the probabilities of life is meant the likelihood, that all
who are born in any particular place or country, or that of any
given number born, so many will be found alive at any given age;
as, for example, according to Dr. Railey's tables, out of one thou-
sand persons born, only five hundred and ninety-eight will live to
reach the twentieth year of their age; but according to the London
tables, of the same number born, three hundred and sixty will
reach that age; thus exhibiting a view of the waste of life from
birth to that age. By the expectation of life is meant, that parti-
cular number of years which a life of a given age has an equal
chance of enjoying; or the time that such a person may reasonably
expect to live. Tables shewing the expectation of life are formed
from those showing the probabilities of life, (r)
(q) 9 Westm. Rev. 417.—(r) 2 Price Obser. 4, 251, 254, 290, 297.
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