Everything that has reached us is a copy, most often very far removed in time, place, and culture from the original. And these copies represent only a small portion of the works even of the most celebrated writers of antiquity. Of Aeschylus’ eighty or ninety plays and the roughly one hundred twenty by Sophocles, only seven each have survived; Euripides and Aristophanes did slightly better: eighteen of ninety-two plays by the former have come down to us; eleven of forty-three by the latter. These are the great success stories. Virtually the entire output of many other writers, famous in antiquity, has disappeared without a trace. Scientists, historians, mathematicians, philosophers, and statesmen have left behind some of their achievements—the invention of trigonometry, for example, or the calculation of position by reference to latitude and longitude, or the rational analysis of political power—but their books are gone. The indefatigable scholar Didymus of Alexandria1 earned the nickname Bronze-Ass (literally, “Brazen-Bowelled”) for having what it took to write more than 3,500 books; apart from a few fragments, all have vanished.
