Note 21 — Chapter V · ON THE PRESUMED SOURCES OF MALARIA.

“Statistical Report on the Sickness, Mortality, and Invaliding among the Troops in the West Indies.” Prepared from the Records of the Army Medical Department and War-Office Returns. London, 1838. It has been objected to these Reports that they embrace only one class of lives. But this does not diminish their value, for the lives they report on are presumed to be the selected lives of men in the prime of life.