It may just be said further, that the slopes of the crater both inside and out are covered with turf, which grows on a dark brown volcanic soil, mingled with rounded pebbles of greenish or purple lava, very compact and close in structure, and containing minute crystals scattered sparingly through it. Occasional blocks of this are found round the edge of the crater wall, and the same rock crops out at many places on the steep inner slopes. I did not notice any vesicular lava or scoria; and at a little homestead not far from the north-eastern foot of Trìtrìva, I was surprised to find the _hàdy_ or fosse dug to twelve or fourteen feet deep almost entirely through the red clay or earth found all through the central regions of the island. The dark brown volcanic soil, here seen in section, appeared to be only eighteen inches deep, with layers of small pebbles. So that the discharge of the volcanic dust and ash appears to have extended only a short distance from the mountain; at least it does not appear to have been very deep, unless, indeed, there has been much denudation. It must be remembered, however, that this point is to the windward side of the hill; probably the volcanic soil is deeper to the west of it. The much greater height of the western wall of the crater is no doubt due to the prevailing easterly winds carrying the bulk of the ejected matter to the west, and piling it up to two or three times the height of the eastern side. After seeing the amount of gneiss rock which must have been blown out of the vent, I expected to have found much greater quantities of it, and in larger blocks, than the very few and small fragments actually seen on the outer slopes. The greater portion, however, is probably covered up under the quantities of volcanic dust and _lapilli_ which were subsequently ejected. Trìtrìva, it will be evident from this slight sketch, will greatly interest those who have a taste for geology and physical geography; while its peculiar and somewhat awe-striking beauty makes it equally worthy of a visit from the artist and the lover of the picturesque. Certainly it became photographed upon our memory with a distinctness which rendered it a vivid mental picture for many a day afterwards. [Sidenote: VOLCANO OF ANKÀRATRA]