[Footnote 50: Joseph Maria Suares, a learned bishop, and the author of a history of Praeneste, has composed a separate dissertation on the seven or eight probable causes of these holes, which has been since reprinted in the Roman Thesaurus of Sallengre. Montfaucon (Diarium, p. 233) pronounces the rapine of the Barbarians to be the unam germanamque causam foraminum. Note: The improbability of this theory is shown by Bunsen, vol. i. p. 239 - M.]