There is another at Ganges, L'Aven Laurien, as picturesque as it is interesting from an archæological point of view. The phenomenon of this pot-hole is one very common in this limestone district. A well gapes before you descending to unknown depths. Honeysuckle, clematis, wild vine droop down it, disguise its presence, and interlace about it in the branches of the ilex and the wild fig, flinging their boughs across the orifice. Bunches of scolopendria let their long fronds droop into the depth, and laurels add their sombre verdure to the clear notes of the deciduous plants. At 150 feet below the mouth of this pot-hole on the mountain flank is a cave, reduced by accumulations to a small opening. One can enter on all fours only. But after having passed within, a spacious chamber is reached about 120 feet in length, with branches as a cross, but at the extremity opposite the entrance it opens abruptly on the verdant well of the aven. It is impossible not to be struck on reaching this point at the picturesque appearance of the cave. It receives light that filters down the aven through the network of foliage above, and long trails of leaves fall from above as though to decorate the unsounded abyss that opens below. Now this cavern was a habitation of neolithic man, as has been shown by finds there of his handiwork. But think of the mothers of families residing there on the brink of that awful gulf! What agonies of apprehension they must have been in when the little urchins played puss-in-the-corner there; when they saw them totter to the verge to look up at the green descending light and the pendent leaves! If a child tripped and went down, its little body could never be recovered. But how docile and meek and mealy-mouthed the wives must have been when, if one raised her voice to scold her lord and master, he could point over his shoulder with his thumb to the unfathomed abyss where it could be silenced for ever—by a push. Another aven again is that of Rabanel, down which M. Martel has descended. Nothing disguises the opening of this horrible well, that sinks precipitously 390 feet. The explorers found a heap of debris at the bottom. "It took us three days to construct the scaffolding for the windlass. I went down first, fastened by a double rope, and I spun round forty-seven times in the void, happy to discover that the only way to save myself from giddiness was to count the revolutions I made. "But what a spectacle when I reached the bottom! A slope of rubbish inclined at thirty-five degrees which one can descend without difficulty for 60 feet, and then a great vault, like the nave of a cathedral, 300 feet long by 45 feet, and 450 feet high, lighted from above by a _lucarne_ of blue sky, the light falling down which, is sifted, strange, glinting with violet reflexions from the walls, whence depended stalactites formed drop by drop like crystal tears."