before even the surface of this hard lava will disintegrate into soil; but the roots of the cactus soon crack it, and a few years suffice to break it up to a sufficient depth to allow of vineyards being planted upon it. Here the same plant has in the same way affected the porous amygdaloid with which the pyramids are faced, and has cut up the surface sadly; but the vegetation which covers them will at any rate defend them from the rains, and now centuries will make but little change in the appearance of these remarkable buildings.
Near Nice there is a hill which gives a wonderfully correct idea of the appearance of the terraced teocallis of Mexico, as they must have looked before time effaced the sharpness of their lines. Where the valley of the Paglione and that of St. Andre meet, the hill between them terminates in a half pyramid, the angle of which lies toward the south; and the inhabitants—as their custom is in southern Europe, have turned the two slopes to account, by building them up into terraces, to prevent the soil they have laboriously carried up from being swept down by the first heavy rain. Seen from the proper point of view the resemblance is complete.