American Journal of Philology

Ptolemy's Geography is at the same time the only survivor of the ancient Greek literature devoted to the topic of drawing maps of the world and is the most extensive ancient list that we possess of names and locations of communities and physical features in the known parts of Europe, Africa, and Asia. It may seem astonishing that a document of exceptional importance for ancient history, geography, and the history of science should have had to wait until now for a complete critical edition. In fact the last complete edition, by C. F. A. Nobbe (1843–45), presents an indiscriminate text with no apparatus beyond a skimpy eighteen-page "Index Criticus" at the end. Two other editions, by F. W. Wilberg and C. H. F. Grashof (1838–45) and by C. Müller and C. T. Fischer (1883–1901), though furnished with apparatus, were vitiated by defective knowledge of the main lines of the textual tradition and besides were never completed. The twentieth century saw major progress in the sorting out of the Geography's manuscripts, with important contributions by (among others) Joseph Fischer, Otto Cuntz, Aubrey Diller, and above all by Paul Schnabel, whose monograph on the subject was meant as a mere harbinger of an edition that he did not live to produce. Meanwhile, scholars in need of a reliable text have had to make do with a patchwork of intentionally partial editions limited to sections of Ptolemy's geographical catalogue covering specific regions.

The biggest obstacle in the way of restoring the Geography arises from one of Ptolemy's profoundest insights, that a graphical object such as a world map can be reproduced more accurately if its contents are translated into a collection of numerical coordinates representing each significant point of the drawing, in effect, a digitization. About two thirds of the Geography is thus dedicated to a list of some eight-thousand place names with the longitudes and latitudes of the corresponding localities expressed in degrees and fractions of a degree, ordered [End Page 128] so that one can reconstruct the map by plotting from point to point on a suitable grid of parallels and meridians. Ptolemy thus got rid of the analogue distortions inherent in the process of copying a picture, but he proposed no measures to protect the copying of the text and numerals of his list from errors giving rise to "noise" progressively obscuring the picture. Unfortunately, Greek alphabetic numerals, notations for common fractions, and exotic place names—many of them attested in no other document—were all liable to frequent misreading in ancient and medieval manuscripts. In such material, copying errors are difficult to detect and generally impossible to undo. The modern scholar, working with an abundance of manuscript copies (none older than the late thirteenth century), is incessantly confronted by variant readings of which at least one must be wrong but for which no rational basis for discriminating exists. To complicate matters further, many of the manuscripts contain maps, and the origin of these maps and their relation to the textual history are controversial questions for which the usual resources of textual criticism are inadequate. It is not surprising if editors' appetites have been sated with modest helpings of the Geography.

Now at last we have a complete and reliable critical edition of Ptolemy's book, an accomplishment made possible in the first instance by a division of labor among a competent and well-organized team, and secondly by judicious choices about what the edition should and should not attempt to do. The team, the "Ptolemaios-Forschungsstelle," affiliated with the Institute for Classical Philology of the University of Berne, comprises more than a dozen scholars led by a philologist, Alfred...