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Another orphan text that no one wanted to enter, but that many nevertheless will be glad to see online. (Why is it that the self-aggrandizements of Cicero, the lecheries and whining of Ovid and the blatherings of that debauched old goose Seneca made it onto the Net before the works that give us solid technical information about what Rome was really good at, viz. the construction of her great buildings and works of engineering?) As almost always, I retyped the text rather than scanning it: not only to minimize errors prior to proofreading, but as an opportunity for me to become intimately familiar with the work, an exercise which I heartily recommend. (Well-meaning attempts to get me to scan text, if successful, would merely turn me into some kind of machine: gambit declined.) Anyway, the text has been thoroughly proofread, and I believe it to be free of errors (but if there are errors, please report them).