=Philip's Work in the South and West.= Leaving the Samaritans, Philip set out for the coast city of Gaza. He probably took the central highway from Jerusalem southward by way of Hebron. A late tradition places the spring where he baptized the Ethiopian official on the tortuous road, practically impassable for chariots, which leads southwestward from Jerusalem, but the older and more probable tradition identifies it with that beside the main road southward, a little north of Bethzur. Thence Philip turned westward, preaching and teaching with success at the old Philistine town of Ashdod, which lay three miles from the Mediterranean, on the border line between the fertile plain and the drifting sands, at the point where the main coast highway divided into its eastern and western branches. =Extension and Expansion of Christianity During the First Decade.= Peter, likewise, turned westward, and at the flourishing city of Lydda, which stood where the main highway from Jerusalem to Joppa crossed the great northern coast road, found a well-established Christian community. Joppa^{(130)} stood on a bold hill looking out over the western sea. It was fitting that here Peter, the natural leader of the rapidly growing Christian church, should have a clear vision of the great and needy Gentile world that lay beyond the narrow bounds of Judea. Joppa was indeed the gateway between Jerusalem, which represented Judaism, and Rome, which stood as the embodiment of regnant heathenism. From Joppa, with its small, rocky harbor, the apostle followed the messengers of Cornelius, the Roman centurion, along the road which closely skirted the shore to Cæsarea, the new door which Herod the Great had opened between Palestine and the Gentile world along the shores of the Mediterranean. Here Peter was far beyond Jewish atmosphere and civilization. The population, the public buildings, and the language of this busy seaport were either Greek or Roman. Thus, before Herod Agrippa in 41 A.D. entered upon his brief but brilliant reign of three years, Christianity had swept over the borders of Judea into the great strategic cities of the western coast plains and even to Damascus, far in the north. It was also breaking the narrow Jewish bonds and following the great western highways that were guiding it on to the conquest of the empire.