Another discovery made in the Mas d'Azil in Arriege, is of painted pebbles and fan-shells that had served as paint-pots. [Footnote: Piette (E.), _Les Galets colorrés du Mas d'Azil._ Paris, 1896.] The pebbles had been decorated with spots, stripes, zig-zags, crosses, and various rude figures; and these were associated with paleolithic tools. In the chalk of Champagne, where there are no cliffs, whole villages of underground habitations have been discovered, but none of these go back to the earliest age of all; they belong to various epochs; but the first to excavate them was the Neolithic man, he who raised the rude stone monuments elsewhere. He had learned to domesticate the ox and the sheep, had made of the dog the friend of man. His wife span and he delved; he dug the clay, and she formed it with her fingers into vessels, on which to this day her finger-prints may be found. These caves are hollowed out in a thick bed of cretaceous rock. The habitations are divided into two unequal parts by a wall cut in the living chalk. To penetrate into the innermost portion of the cave, one has to descend by steps cut in the stone, and these steps bear indications of long usage. The entrance is hewn out of a massive screen of rock, left for the purpose, and on each side of the doorway the edges show the rebate which served to receive a wooden door-frame. Two small holes on the right and left were used for fixing bars across to hold the door fast. A good many of these caves are provided with a ventilating shaft, and some skilful contrivances were had recourse to for keeping out water. Inside are shelves, recesses cut in the chalk, for lamps, and to serve as cupboards. But probably these are due to later occupants. The Baron de Baye, who explored these caves, picked up worked flints, showing that their primitive occupants had been men of the prehistoric age, and other caves associated with them that were sepulchral were indisputably of the Neolithic age. [Footnote: De Baye (J.), _L'Archéologie préhistorique._ Paris, 1888.] Mankind progresses not smoothly, as by a sliding carpet ascent, but by rugged steps broken by gaps. He halts long on one stage before taking the next. Often he remains stationary, unable to form resolution to step forward; sometimes even has turned round and retrograded.