Diagram showing the relation between the death-rate from small-pox, and the proportion of population protected by Vaccination, in each district of the United Provinces.

[NLS note: a graphic appears here - see image of page]

The black lines and figures indicate proportion of population protected by Vaccination during the year 1902-1003 and the six years preceding it.
The red lines and figures indicate the death-rate from small-pox during 1902