ocr: and Roman pottery to establish once and for all a complete corpus ofthis material, which will be ofi inestimable value as an archaeological tool for the further investigation of this and other Nabataean sites. Tot this aspect of our work,Ishall return later. For the moment I shall summarize what we have learned from the excavations about the development of building methods and architecture at Petra, with special reference to our central theme of the progress of Hellenization at the site. Four main phases of building activity have been investigated in various parts of the city, and although iti ...