On leaving Arles, the train takes the bit between its teeth and races over the _crau_, straight as an arrow, between lines of cypresses. It is just possible to catch glimpses to the north, between the cypresses, of a chain of hills of opalescent hue. That chain, Les Alpines, gives its direction to the Durance. This river lent its aid to Brother Rhone to form this rubble plain, the _Campus lapideus_ of the Romans, the modern _crau_. This was a desert over which the mirage alternated with the Mistral, till Adam de Craponne, in the sixteenth century, brought a canal from the Durance to water the stony land, and since then, little by little, the desert is being reclaimed. This vast stony plain was a puzzle to the ancients, and Æschylus, who flourished B.C. 472, tells us that Heracles, arriving at this plain to fight the Ligurians, and being without weapons, Heaven came to his aid and poured down great stones out of the sky against his foes. This is much like the account in Joshua of the battle against the Kings in the plain of Esdraelon. At length, at Miramas, we escape from between the espalier cypresses and see that the distant chain has drawn nearer, that it has lost its mother-of-pearl tints, and has assumed a ghastly whiteness. Then we dash among these cretaceous rocks, desolate, forbidding and dead. They will attend us from Marseilles to Toulon. The cretaceous sea bed, that once occupied so vast an area, has been lifted into downs and mountains, and stretched from Dorset and Wiltshire to Dover. We catch a glimpse of it at Amiens. A nodule that has defied erosion sustains the town and cathedral of Laon. It underlies the Champagne country. It asserts itself sullenly and resolutely in Provence, where it overlies the Jura limestone, and is almost indistinguishable from it at the junction, for it has the same inclination, the same fossils, and the same mineralogical constituents. In England we are accustomed to the soft skin of thymy turf that covers the chalk on our downs. Of this there is none in Provence. The fierce sun forbids it. Consequently the rock is naked and cadaverously white, but scantily sprinkled over with stunted pines.