Aude Doody and Liba Taub Introduction Harry M. Hine Subjectivity and Objectivity in Latin Scientific and Technical Literature Alice König From Architect to Imperator: Vitruvius and his Addressee in the De Architectura Vivian Nutton Galen's Authorical Voice: a Preliminary Enquiry Todd Curtis Didactic and Rhetorical Strategies in Galen's De pulsibus ad tirones Laurence M. V. Totelin Galnes's Use of Multiple Manuscript Copies in his Pharmacological Treatises Aude Doody Authority and Authorship in the Medicina Plinii David Leith Question-Types in Medical Catechism on Papyrus Liba Taub Explaining a Volcana Naturally: Aetna and the Choice of Poetry