Again, the study of the Bollandists throws light upon the past history and present state of Palestine. Thus the indefatigable Papebrock, equally at home in the most various kinds of learning, discusses the history of the Bishops and Patriarchs of Jerusalem, in a tract preliminary to the third volume for May. But, not content with a subject so wide, he branches off to treat of divers other questions relating to Oriental history, such as the Essenes and the origin of Monasticism, the Saracenic persecution of the Eastern Christians, and the introduction of the Arabic notation into Europe. On this last head the Bollandists anticipate some modern speculations.[10] He maintains, on the authority of a Greek manuscript in the Vatican, written by an Eastern monk, Maximus Planudes, about 1270, that, while the Arabs derived their notation from the Brahmins of India, about A.D. 200, they only introduced it into Eastern Europe so late as the thirteenth century. Upon the geography of Palestine again they give us information. All modern works of travel or survey dealing with the Holy Land, make frequent reference to the records left us by men like Eusebius and Jerome, and the itineraries of the "Bordeaux Pilgrim," of Bishop Arculf, A.D., 700, Benjamin of Tudela, A.D. 1163, and others. In the second volume for May, we have presented to us two itineraries, one of which seems to have escaped general notice. One is the record of Antoninus Martyr, a traveller in the seventh century. This is well known and often quoted. The other is the diary of a Greek priest, Joannes Phocas, describing "the castles and cities from Antioch to Jerusalem, together with the holy places of Syria, Ph[oe]nicia, and Palestine," as they were seen by him in the year 1185. This manuscript, first published in the "Acta Sanctorum," was discovered in the island of Chios, by Leo Allatius, afterwards librarian of the Vatican. It is very rich in interesting details concerning the state of Palestine and Christian tradition in the twelfth century. The Bollandists again were the first to bring prominently forward in the last volume of June the "Ancient Roman Calendar of Polemeus Silvius." This seems to have been a combined calendar and diary, kept by some citizen of Rome in the middle of the fifth century. It records from day to day the state of the weather, the direction of the wind, the birthdays of eminent characters in history, poets like Virgil, orators like Cicero, emperors like Vespasian and Julian; and is at the same time most important as showing the large intermixture of heathen ideas and fashions which still continued paramount in Rome a century and a half after the triumph of Christianity.