London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
London County Council 1908
[Report of the Medical Officer of Health for London County Council]
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DIAGRAM 3.
Diagram shewing the proportion of each of four species to the total number of flies
caought at the nine centres in successive weeks from July to October 1908.
N.B. The percentage of flies of each species is represented by the ratio of the shaded areas to the total area of each square in the diagram. The figures
shewn in each square, denote the number of flies caught in each week at each centre.