BACOT : MOSQUITOES AND THE DANGER OF MALARIA. 255
that the range of the disease was dependent upon the distribution
of infected persons, it seems probable that the more important
FIG. 8.— THE FORMER DISTRIBUTION OF AGUE IN ENGLAND.
factor was the prevalence or scarcity of the mosquitoes.
In some few instances, cases of Ague are recorded in places
where the mosquitoes have not been found. This is, however,
not surprising ; for the chart of the disease is based on the records