seems unlikely that a book of this kind could properly be produced in this age of specialized scholarship without collaboration. In such a book it is not easy to show the exact contribution of each collaborator, but the division of labor and responsibility was approximately as follows. John F. C. Richards collated the manuscripts and editions and prepared the critical notes to the Greek text. He is also responsible for the translation, though Earle R. Caley made many suggestions, so that to some degree this translation may be considered a joint production. The Introduction and the Commentary were written jointly; John F. C. Richards supplied the notes of linguistic interest, but most of the material in the Commentary was contributed by Earle R. Caley. This includes the identification of precious stones and other mineral substances, the discussion of problems in the field of archaeology, chemistry, or mineralogy, and other matters of scientific or technological interest.
We hereby express our sincere thanks to all those who have helped us in our task. Among those who have been especially helpful with criticisms and suggestions are Professor Gilbert Highet of Columbia University and Professors Kenneth M. Abbott, William R. Jones, Lowell Ragatz, and Everett Walters of the Ohio State University. Finally we express our gratitude to the authorities of the Graduate School of the Ohio State University for their generosity in sponsoring the publication of this book.
E. R. C. J. F. C. R.
COLUMBUS, OHIO
September, 1956