"Thus, as we see, this polishing-stone, which is one of the most complete in existence, has on it three basins of different sizes, two well-defined grooves, and one only just sketched out. It would serve for finishing off all the instruments that could be required; but, nevertheless, two other sandstones of moderate size were found near it; one round, and the other of a spindle-like shape; these, which were worn and rubbed all over their surfaces, must also have been used in polishing objects. "Finding these stones was, however, a thing of frequent occurrence in several spots of this locality, where I often met with them; they were of all sizes and all shapes, and perfectly adapted for polishing small flints, needles, and the cutting edges of knives, deposited with them in the sepulchres. "This polishing-stone, which is thickly covered with _dendrites_ or incrustations, must have been in use at the time it was abandoned. I found it about 2 feet below the surface of the soil, in which it was turned upside down; that is, the basin lay next the earth. The few monuments that were with it--one among which I looked upon as an idol roughly carved in a block of sandstone--were all likewise turned upside down. There had been sepulchres in the neighbourhood, but they had been violated; and the displaced stones, as well as the bones themselves, only served to point out the presence of the former burial-place." The polishing of stone instruments was effected by rubbing the object operated upon in a cavity hollowed out in the centre of the polisher, in which cavity a little water was poured, mixed with zircon or corundum powder, or, perhaps, merely with oxide of iron, which is used by jewellers in carrying out the same operation. It is really surprising to learn what an enormous quantity of flints could be prepared by a single workman, provided with the proper utensils. For information on this point, it is requisite to know what could be done by our former flint-workers in the departments of Indre and Loire-et-Cher, who are, in fact, the descendants of the workmen of the Stone Age. Dolomieu, a French naturalist, desired at the beginning of the century to acquaint himself with the quantity which these workmen could produce, and at the same time to thoroughly understand the process which they employed in manufacturing gun-flints.