Statistics for occurrence #1 of “Dr. James Jackson” in chapter 2, page 14 of Edward L. Pierce, Memoir and letters of Charles Sumner: volume 1:

...ther on the Sabbath, to and from the meeting-house! Charles Pinckney Sumner entered Harvard College in 1792, and graduated in 1796. The members of his class who became most widely known were Dr. James Jackson , the eminent physician, who survived till 1867; Rev. Dr. Leonard Woods; and John Pickering. His college quarterly-bills, including board
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