At intervals the rocks fall back and form open spaces, and at one describe an amphitheatre upon a vista of rolling forest.

But if this "petrified forest," as it has been called, served as a refuge for the peasants in troublous times, it has also been employed by brigands as their fastness whence to ravage the country and render the roads perilous. But of their exploits I shall have more to say in the chapter on robber-dens.

Caverns, as well as chasms, have always served this same purpose.

There is something remarkably human and significant in the prophecy of Isaiah relative to the coming of the Judge of all the earth: "They shall go into the holes of the rocks, and into the caves of the earth, for fear of the Lord, and for the glory of his majesty." And in the Book of Revelation: "And the kings of the earth, and the great men, and the rich men, and the chief captains, and the mighty men, and every bondman, and every free man, hid themselves in the dens and in the rocks of the mountains."

As the first men found their refuges and homes in caves and rock shelters, so the last men, with the instinct implanted in them from the first and never eradicated, will fly to the earth as a hiding-place, just as a frightened child flies to the lap of its mother.

When Ahab persecuted the prophets, Obadiah hid them by fifties in a cave. After the battle of Bethhoron the five kings of the Amorites hid themselves in the cave of Makkedah. When the Midianites oppressed Israel, the latter "made them the dens which are in the mountains, and caves and strongholds." From the Philistines "the people did hide themselves in caves and in thickets and in high places, and in pits." Twice did Elijah take refuge in a cave.

What took place in Palestine, took place in every part of the world wherever there are limestone and chalk and volcanic breccia and sandstone. It would seem as though a merciful Providence had not only provided the first shelters for man against the inclemency of the weather, but had also furnished him with places of secure refuge against the violence of his fellow-man. As sure as the rabbit runs to its hole on the sight of the sportsman, so did the oppressed and timorous when the slayer and the marauder appeared.

In the South of France, where caves abound, the unhappy Gauls fled from Cæsar and concealed themselves in them. He bade his lieutenant Crassus wall up the entrances. When the Armenians fled before Corbulo—"fuere qui se speluncis et carissima secum abderent"—he filled the mouths of the caverns with faggots and burned them out. [Footnote: Tacit., "Annals," xvi. 23.]

When Civilis rose in insurrection against Vespasian, he was joined by a young native, Julius Sabinus from Langres, who boasted that, in the great war with the Gauls, his great-grandmother had taken the fancy of Julius Caesar, and that to him he owed his name.

After the death of Nero, the Druids had come forth from the retreats where they had remained concealed since their proscription by Claudius, and proclaimed that "the Roman Empire was at an end, and that the Gallic Empire was come to its birth." Insurgents rose on every side, and Julius Sabinus assumed the title of Caesar. War broke out; confusion, hesitation, and actual desertion extended through the Colonies, and reached the legions. Several towns submitted to the insurgents. Some legions yielding to persuasion, bribery, or discontent, killed their officers and went over to the rebels. The gravity of the situation was perceived in Rome, and Petilius Cerealis was despatched to crush the revolt. The struggle that ensued was fierce but brief, and Civilis was constrained to surrender. Vespasian being disinclined to drive men or matters to an extremity, pardoned him; but no mercy was to be extended to Julius Sabinus. After the ruin of his cause, Sabinus took refuge underground in one of those retreats excavated in the chalk beneath his villa, and two of his freedmen were alone privy to the secret. The further to conceal him, they set fire to his house, and gave out that he had poisoned himself and that his dead body had been consumed in the flames. His young wife, named Eponia, was in frantic despair at the news; but one of the freedmen informed her of the place of his retreat, and advised her to assume the habit and exhibit the desolation of widowhood, so as to confirm the report they had disseminated. "Well did she play her part," says Plutarch, "in this tragedy of woe." She visited her husband in his cave at night, and left him at daybreak, but at last refused to leave him at all. At the end of seven months, hearing talk of the clemency of Vespasian, she set out for Rome taking her husband with her, disguised as a slave, with shaven head and a dress that rendered him unrecognisable. But friends who were in her confidence dissuaded her from prosecuting the journey. The imperial clemency was not a quality to be calculated upon with confidence. They accordingly returned to their subterranean abode. There they lived for nine years, during which, "as a lioness in her den," says Plutarch, "Eponia gave birth to two young whelps, and suckled them at her own breast." At length they were discovered, and Sabinus and his wife were brought before Vespasian.