The road beyond this rises from the valley of the Almo, and passes over a kind of plateau. It is hemmed in on either side by high ugly walls, shaggy with a profusion of plants which affect such situations. The wild mignonette hangs out its pale yellow spikes of blossoms, but without the fragrance for which its garden sister is so remarkable; and the common pellitory, a near ally of the nettle, which haunts all old ruins, clings in great masses to the crevices, its leaves and ignoble blossoms white with the dust of the road. Here and there a tall straggling plant of purple lithospermum has found a footing, and flourishes aloft its dark violet tiara of blossoms; while bright tufts of wall-flower send up their tongues of flame from an old tomb peering above the wall, as if from a funeral pyre. The St. Mary thistle grows at the foot of the walls in knots of large, spreading, crinkled leaves, beautifully scalloped at the edges; the glazed surface reticulated with lacteal veins, retaining the milk that, according to the legend, flowed from the Virgin's breast, and, forming the Milky Way in mid-heaven, fell down to earth upon this wayside thistle. Huge columns of cactuses and monster aloes may be seen rising above the top of the walls, like relics of a geologic flora contemporaneous with the age of the extinct volcanoes around. But the most curious of all the plants that adorn the walls is a kind of ivy which, instead of the usual dark-greenish or black berries, bears yellow ones. This species is rare, but here it occurs in profusion, and is as beautiful in foliage as it is singular in fruit. The walls themselves, apart from their floral adorning, are very remarkable, and deserving of the most careful and leisurely study. They are built up evidently of the remains of tombs; and numerous fragments of marble sarcophagi, pillars, inscriptions, and rich sculpture are imbedded in them, suggestive of a whole volume of antiquarian lore, so that he who runs may read. On the right of the road, in a vineyard, are several Columbaria belonging to the family of Caecilius, an obscure Latin poet, who was a predecessor of Terence, and died one hundred and sixty-eight years before Christ; and on the left are the Columbaria of the freedmen of Augustus and Livia, divided into three chambers. These last when discovered excited the utmost interest among antiquarians; but they are now stripped of all their contents and characteristic decorations, and the inscriptions, about three hundred in number, are preserved in the museums of the Capitol and Vatican. On the same side of the road, in a vineyard, a Columbarium was discovered in 1825 belonging to the Volusian family, who flourished in the reign of Nero; one of whose members, Lucius Volusius, who lived to the age of ninety-three, was extolled on account of his exemplary life by Tacitus.