My Life in Two Hemispheres. With Portrait. Introduction by John H. Whyte. Two Volumes. Shannon: I.U.P. 1969. Facsimile edition. Pp (I)xi, 335; (ii) xi 395. Green buckram, in publishers plain dust jackets printed in green. Charles Gavan Duffy was the most prolific historian of 19th century Ireland. He was a leading figure in Irish politics between 1842 and 1855, taking part in the repeal of the union with Britain (1840's) and the Tenant League (1850's).