The Advocate is pleased to announce the third reading in this Spring's poetry informals series. Robert Ullian, who runs a prose workshop at South House and who is most recently published in this month's Esquire (an antiwar article about dog food), and Lewis Sckolnick, a Cambridge poet who has studied with James Dickey and Anais Nin, will read from their work tonight at 8 p.m. in the Advocate House, 21 South Street.