Figure 6.      The effect of temperature on malaria transmission: (a) duration of the sporogonic cycle 'n ' in days (Macdonald, 1957; Detinova, 1962) the higher the temperature the shorter the cycle; (b) daily mosquito survival 'p ' as defined by Martens (Martens, 1997), (c) the percentage of mosquitoes that survive after the full period required for completion of sporogeny 'p n '.