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 
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 
