Immediately below the palace is one of the rapids called by the Greeks _Megalé roë_, and by the Turks, _Buyuk akindisi_, over which the stream tumbles sometimes with the velocity and turbulence of a cataract, and is supposed to be one of the evidences of that awful convulsion which tore open the strait, and sent the waters of the upper ocean down to the lower regions in an eternal current. As no vessel can ascend here by force of oars, it is necessary to tow them. The shore is seen lined with men holding coils of cord: when a vessel arrives, the efforts of the crew are suspended; the coil is cast to the ship, and fastened to the prow; it is then passed over the shoulders of a long line of men, and by main force, and most laborious exertions, the largest and most ponderous ships of the Black sea are thus dragged up the descent, with a bodily strength and perseverance which a Turkish hammal alone can exert. When the lighter caïque arrives, it ascends with little labour. The passenger then wraps a few paras in a morsel of paper, throws them ashore to the robust assistants, the tow is thrown off, and the light caïque, now arrived at the summit, shoots on its way. The introduction of steam-boats was opposed, as depriving so many persons of a means of support, but they are now used for larger vessels, and partly abridge this painful toil. [Illustration: T. Allom. E. Benjamin. THE RUINS OF HIERAPOLIS.--NOW CALLED PAMBOUK KALESI. ON THE WAY FROM LAODICEA. ASIA MINOR.] Hierapolis, or “the Sacred City,” stands on the confines of ancient Caria and Lydia, in Asia Minor, and a few miles from Laodicea. It is now called _Pambouk kalesi_, the first part of the name signifies “cotton,” from a very singular phenomenon. On approaching the place, the traveller sees before him the sloping face of a hill, of a pure white, and apparently fleecy texture, swelling into little eminences, and resembling a mass of wool laid upon the surface, and as if slightly agitated by the wind. The soil abounds with hot springs, and this singular appearance is a pure white concrete substance, generated by the water flowing over the steep, and leaving behind a chalky deposit. On being tested with acids, it is found to ferment; and like the dropping-well at Knaresborough, and from the same cause, leaving behind it an incrustated surface of carbonate of lime wherever it flows. The abundance of this concrete deposit was so great formerly, that it performed the function of Amphion’s lyre, and raised spontaneous walls. The water was conducted round edifices and enclosures, and the channels then became long fences of a single stone. When the rill first drips over any surface, it leaves behind it a lurid appearance, resembling wet salt, or half-dissolved snow. Several of the vineyards and gardens are now fenced with this substance.