Weapons and ornaments and utensils now only remain. To take the last-named first, at no period have vessels of earthenware been sold by weight. On the other hand those of metal, especially when made of copper and iron, are usually sold in this fashion, although vessels of iron and tin are commonly sold by bulk, or according to their capacity, thereby following, as we shall shortly see, a most ancient precedent. The value of ornaments largely consists in the artistic skill displayed in their manufacture, hence weight is not employed in estimating their value except when the material is gold or silver, and therefore possesses a certain intrinsic value apart from the mere workmanship. We may therefore infer that in early times no decorative articles save those in metal were valued by weight. Next comes the question of weapons, one of the most important sides of ancient life. Of course gold and silver are unfit for weapons and implements, save in the case of the gods, as for instance the chariot of Hera, with its wheel-naves of silver and its tires of gold[164]. The spear-head and sword-blade must be made from tougher and cheaper metals. Hence copper or bronze (copper alloyed with tin) in the earlier periods which succeeded the stone age, and iron at a later time, have mainly provided mankind with weapons of offence and defence. But precious as copper and bronze and iron were to the primitive man, we do not find them sold by weight: a simple process was employed; the crude metal was made into pieces or bars of certain dimensions, so many finger-breadths or thumb-breadths long, so many broad, so many thick, just as wooden planks are now sold with us, when the value of a piece of timber is estimated by its being so many feet of inch board, or half-inch board, and of a fixed width. Lastly we come to the question of clothing. Skins of course were sold by bulk, the hide of an ox or a sheepskin having generally a fixed and constant value. Even when sheep came to be shorn, the fleece was set at an average value. But beyond all doubt among the peoples who dwelt around the Mediterranean the practice of weighing wool was of a most respectable antiquity. Such, too, was the practice all through the middle ages in England and on the Continent. We have abundant specimens still left of the weights carried by the wool merchants, slung over the back of a pack-horse.