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Deaths of Slaves in the Middle Passage

It is widely accepted by students of the slave trade that slave mortality during the Middle Passage fell between the seventeenth and early nineteenth centuries. The first person to make the claim of declining mortality was Philip Curtin, who reopened research on slave mortality in his book The Atlantic Slave Trade: A Census. Curtin examined a number of sources, and his conclusion was that “… there is a decreasing rate of loss over the eighteenth and nineteenth centuries.” Curtin's book stimulated a great deal of further research, much of it by Herbert Klein. Klein's conclusion was the same as Curtin's: “it is undoubtedly true that over the whole of the 18th century, mortality in the Middle Passage was on the decline.” This result has since been repeated in a number of places. Riley has recently summed up the consensus view on the subject: “Most students of this question report that mortality declined over time, but the available data are sporadic in time and place.” The only dissenting view has come from Postma who found “no discernible trend toward decrease or increase in the overall pattern” in the Dutch trade.