Some correspondence, which has come to the Society, of the Mayor of Boston in April, 1851, in regard to the threat of a “tumult, riot, and mob” over a fugitive slave case, recalls the time when slavery was not only a very live issue, but one which split the North into two bitterly hostile camps. For years Boston abolitionists carried on their campaign in the midst of a community hardly more sympathetic with their views than the South itself.