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These diagrams are based upon the figures contained in Tables II. (e),
and VIII. (c), IX. (c), and X. (c). In the case of each curve the distance of each
successive point of the curve above or below the dotted line represents the increase
or decrease per cent, in the death rates at successive age groups obtaining in the
period to which the curve relates, compared with the corresponding death rates
obtaining in the period 1861-70.
N.B.—In the diagrams relating to measles, whooping cough, and diphtheria
and croup, to ensure greater clearness and to avoid intersection of the curves, a
separate dotted line is drawn for each curve, the dotted lines following the same
chronological order as the curves, i.e., the first curve shown, for each of these
diseases, relating to the period 1871-80, is drawn in relation to the first dotted
line; the second curve (1881-90) in relation to the second dotted line, &c. In the
case of scarlet fever each of the curves have been drawn in relation to the same
dotted line, the use of more than one dotted line being unnecessary owing to the
progressive decline of the scarlet fever death rates at each age period.
Each square in the diagrams represents 10 per cent.