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London 1909.17.
Diagram showing the seasonal and annual prevalence
of fleas over a series of years and the incidence of searlet fever in the
corresponding period.
Diagram showing the dates of air raids {dotted vertical lines},
the notifications of scarlet fever and measles, and the proportions of
flea.bitten children for the weeks ending 1st. september 1917 to 23rd March
1918. {The air raids associated with special crowding in shelters are
lettered A.B and C; possible corresponding curve relationship are similarly
lettered.}