The hand mill from the earliest period down to the latest consists of a flat lower stone, usually hollowed by use, and a rubbing stone, which was rubbed backwards and forwards on it, both of basalt (Fig. 180). Fragments of these rubbing-mills are found in great numbers on all the ruined sites of Babylonia, where they are mistaken by inexperienced observers for the upper parts of stelae with reliefs. Of the circular revolving mills that are found to-day in almost every Arab house, there are scarcely any remains in the upper level of Amran. Funnel-shaped mills, such as the Romans possessed, were apparently unknown. As the rubbing stone was employed with the mill, so also the rubbing-bowls possessed small rubbers, which were held in the hand. The lower side of these show the smoothness that results from use (Fig. 181). Beside these rubbers there are many stones of much the same size that show marks of having been used for pounding; many are cubes, and have been used on all sides, others are discs, and their edges have been used. Not all of these can be assigned to the historic period. [Illustration: FIG. 182.—Prehistoric implements. ] Some stones with holes bored in them are apparently prehistoric. Some are certainly mace heads, or something of the sort. Of the palaeolithic saws of obsidian and of flint, with their nuclei (Fig. 182), which are spread over the entire prehistoric world with such remarkable uniformity, various specimens are found, though naturally not so many as on more ancient sites, Fara or Surgul. In Fara some of these saws were still in their ancient setting, which consisted of an asphalt backing, in which they were set on the cutting side, often one after another, in order to lengthen the implement. In this way it was impossible to use the fine cutting edge, and in fact the polish acquired by long use appears only on the toothed edges; but owing to the projection of the backing the latter could never have cut into anything to a greater depth than about 1 centimetre. Of neolithic implements only one single arrow-head has been found, and in Fara and Surgul, so far as I can remember, no neolithic implements have been found. [Illustration: FIG. 183.—Swords, lance-head, and knives in bronze. ] [Illustration: FIG. 184.—Bronze arrow-heads; prehistoric flint knife and saws. ] [Illustration: FIG. 185.—Chain of onyx beads from a grave in Merkes. ]