Figure 2
From: Natural relapses in vivax malaria induced by Anopheles mosquitoes
Monthly deaths from malaria in 1750–1850 on SW-coast and in the archipelago correlated with June-July temperatures (blue bars). Malaria year is virtually moved from the base year backwards and forwards in time by means of a successive shift of the base year for the temperature records (red vertical bar) in the opposite direction, i.e. forwards and backwards in time. The cumulative monthly death cases from malaria in 1750–1850 (annually repeated red curve), illustrate the monthly frequency of malaria. See also text.