Carlyle was for many years on terms of closest friendship with John Stuart Mill, John Sterling, & Robert Browning. The letters to Mill, nearly eighty in number, fill more than half the volume. The letters to John Sterling, whom Carlyle met through Mill & whose biography he afterward wrote, are thirty-three in number. The letters to Browning are not many, for the poet lived within easy reach of Cheyne Row. "This is a rich volume."--TIMES LITERARY SUPPLEMENT.