As we have spent some time in learning the different objects manufactured out of bronze, it may be of interest to learn somewhat of their methods of working bronze. We have already stated how the amateur worker in bronze would follow on after the trader—and so the objects of bronze would be made in all the countries of Europe. Molds have been found in various places. This is a mold for casting the axes having a socket in which to put the handle. It was found in the cave at Heathbury Burn, already mentioned. None of the bronze objects were forged out, as a smith forges out objects of iron—they were cast. In the absence of steel, it would be almost impossible to cut bronze; hence it was necessary to make the casting as nearly perfect as possible. Sometimes the molds were cut out of stone, as in the figure just given. The molds themselves were, in this case, difficult to make; besides, they could scarcely be made so perfect as not to leave a little ridge, where the two halves of the mold came together, which, as just explained, owing to the absence of steel, it would be very difficult to remove. In process of time they discovered an easier way of making the molds, that employed at the present day—that is, by the use of sand. The ridge would still remain, and is to be plainly seen on specimens of ancient bronze. To overcome the difficulty just mentioned, they invented a third method of casting, which displays great ingenuity. A model of the object desired was made of wood or wax, and inclosed in prepared earth mixed with some inflammable material, in order that, when subjected to heat, it might become porous. The whole was then heated until the wax or wood disappeared. The mold was then ready for use. The great advantage of this method was that there were no projecting lines of junction to disfigure the complete implement. This seems to have been the most common method employed. This explains the fact, that we seldom find any two bronze objects exactly similar to one another. Any impression left on the wax model would be faithfully reproduced. Marks of the spatula, with which the wax was worked, are frequently found; and, in one case, the impression of the human finger was observed.17