9

      From these results we are justified in concluding that a native who is born
on the Salonah tea estate will acquire almost complete immunity to malarial
fever by the time adult age is reached, and it is obvious that if such a native,
after reaching the age of 25—30 years, begins to suffer severely from a disease
characterised by fever and enlargement of the spleen, it is in the highest degree
improbable that this disease is malaria.

C