FIRST edition, published in three volumes, 1768-1771.
SECOND " " ten " 1777-1784.
THIRD " " eighteen " 1788-1797.
FOURTH " " twenty " 1801-1810.
FIFTH " " twenty " 1815-1817.
SIXTH " " twenty " 1823-1824.
SEVENTH " " twenty-one " 1830-1842.
EIGHTH " " twenty-two " 1853-1860.
NINTH " " twenty-five " 1875-1889.
TENTH " ninth edition and eleven
supplementary volumes, 1902-1903.
ELEVENTH " published in twenty-nine volumes, 1910-1911.