of this wonderful feature; its extraordinary appearance will never be out of my remembrance. It is no doubt of volcanic origin, belched out of the bowels, and on to the surface, of the earth, by the sulphurous upheavings of subterraneous and subaqueous fires, and cooled and solidified into monstrous masses by the gelid currents of the deepmost waves of the most ancient of former oceans. As I before remarked, it is composed of mixed and rounded stones, formed into rounded shapes, but some upon the eastern side are turreted, and some almost pillars, except that their thickness is rather out of proportion to their height. The highest point of the whole, as given before, is 1500 feet above the ground, while it is 2800 feet above the sea-level. Could I be buried at Mount Olga, I should certainly borrow Sir Christopher Wren's epitaph, Circumspice si monumentum requiris. To the eastward from here, as mentioned in my first expedition, and not very far off, lay another strange and singular-looking mound, similar perhaps to this. Beyond that, and still further to the east, and a very long way off, was another mount or hill or range, but very indistinct from distance. On the 9th we went away to the near bare-looking mountain to the east; it was twenty miles. We found a very fine deep pool of water lying in sand under the abrupt and rocky face of the mount upon its southern side. There was also a fine, deep, shady, and roomy cave here, ornamented in the usual aboriginal fashion. There were two marks upon the walls, three or four feet long, in parallel lines with spots between them.