I found this reference to Petty but did not know how to trace down the
source.  Again, any help would be appreciated:

The'baud, Augustus J. and John Habberton. 1902. Ireland Past and
Present: Past and Present (New York: P.F. Collier & Son).

385: "Sir William Petty says that "of boys and girls alone" --
exclusive, consequently, of men and women -- "six thousand were thus
transplanted; but the total number of Irish sent to perish in the
tobacco-islands, as they were called, was estimated in some Irish
accounts at one hundred thousand"."


Michael Perelman