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5
was the last year of the seventh period. There is hut little
doubt that in the course of time we shall he able to ascertain the
causes which retard or accelerate the epidemic periods, but at
present we have not sufficient reliable data upon which to base
our calculations.
If we now group the several mortalities under the headings of
the first, second, third, and fourth years of each period of four
years, we shall bring out the facts that the number of deaths iu
all the first years was more than two fifths of the whole; that
the number in second and fourth years of each period was nearly
the same, viz.: 5239 and 5389 respectively; that of the third
was much below either of the others, viz.: 3078 only. The
number 5397 should be increased by one-seventh, as it contains
one year less than the other columns and ought therefore to be
6168 or thereabouts. The necessary correction is made in the
per centageS.

As will be seen from the above table, the per centages of the
total number of deaths, corrected for the blank in the fourth