In Derry on the evening of sept 20 six bombs exploded in a local fertiliser factory and Field Day launched its fourth dramatic productiuon in the stately Guildhall. In this city, as in most of Northern Ireland, it is impossible to separate politics and culture. Brian Friel and the five other directors of the three-year od Field Day Theatre Company, all writers or arttists from the north, sem subtly aware of this fact. THeir current choice of Boesman and Lena, Athol Fugard's play on the evils of apartheid in South Afriica, is entirely consistent with teir policy of artist commitment.