The Turanian tribes, who had so long inhabited Europe, were suddenly confronted by the victorious hosts of the Celts, the vanguard of the Aryans, the precursors of a higher culture. The movements of these primitive people could not fail to have a great effect on the human mind. It would become alert, keen, and active. Such was the state of ancient society when a knowledge of bronze was introduced—a discovery which consigned stone, hitherto the substance most commonly made use of to advance human interests, to a subordinate position, and opened up for man the exhaustless mineral stores of nature.
It is suggested by some that gold was the first metallic substance employed. Its glittering particles would attract the attention of primitive man, and little articles of ornament were early manufactured from it. To be sure, the supply was very limited; but what there was would serve the useful purpose of imparting to men some idea of metallic substances. Portions of it falling in the fire might have suggested the idea of smelting and of molding—might, at least, have lead to experiments in that line. The supply of gold existing in a native state is so small, that no use could have been made of it except for ornaments.
Iron, we know, is the most abundant mineral. But it is very rare in a native state, and its ores have nothing distinguishing about them, and so it is not strange that another metal received the attention of primitive man. That metal was probably copper. It is often found in a pure state in nature. In the Michigan mines of our own country, masses of pure copper many tons in weight have been discovered.5 No such rich deposits are found in the Old World; but considerable quantities of native copper were obtained, and it was by no means a rare metal. Copper possesses several qualities that would attract attention. It is quite malleable; that is, it can be easily hammered into shape. We can imagine the surprise of the old stone-workers at finding a stone that, instead of breaking or splitting, could be hammered into shape. By accident, or otherwise it would be learned, in time, that it could be melted. This would lead to the idea of molding.
If the above process were followed out, there would be a real Copper Age preceding that of Bronze: no trace of such an age has yet been detected in Europe. “But there is, however, every reason for believing, that, in some parts of the world, the use of native copper must have continued for a lengthened period before it was discovered that the addition of a small portion of tin not only rendered it more fusible, but added to its elasticity and hardness.”6 The absence of a Copper Age in Europe would imply that the art of manufacturing bronze was discovered in some other locality.
Copper by itself is so soft that it would not be of much use to man, except the experience they would gain of melting and molding. In our own country the aboriginal inhabitants were well acquainted with copper, and even knew how to mold it. Yet, except as just pointed out, it is not probable that it exerted any marked influence on their development.7 In the old world supplies of native copper are limited, and recourse must be had to the ores of copper. Now these ores, such as copper-pyrites, are nearly always of a bright color, and as such would attract the attention of primitive man. They might suspect that these bright colored ores contained copper from finding similarly colored ores in connection with native copper, in fact passing from one form to the other. But it requires no little skill to reduce the ores of copper; and, when obtained, for reasons just pointed out, it would not be of great utility. But primitive man was thus cautiously and experimentally feeling his way to a knowledge of metallurgy.
All the evidence obtainable goes to show that tin was known as early as copper, or at least soon after. Its ores though not striking on account of their color, are on account of their great weight. It is comparatively easy to reduce it from its ores. It is quite widely distributed over the earth. It often occurs in the gravels of rivers, where, as we have already mentioned, primitive men must have, at a very early date, sought for gold. Owing to their weight, the gravel of tin-stone would remain behind with the gold when it was washed. “In process of time its real nature might have been revealed by accident; and, before the eye of the astonished beholder, the dull stone, flung into the fire, became transfigured into the glittering metal.”8
When two metals come together in a molten state, they often form, not a mixture of the two, part copper and part tin, for example, but a new compound, different from either, called an alloy. Copper is, so to speak, a sociable metal, and readily unites with many different metals—amongst others with tin, when it forms bronze, the article that marks a new state in the history of primitive culture. It seems to us strange that an alloy, a combination of two different metals, should have been the first used by man, and not a simple metal like iron. Such, however, is the fact of the case; and we have tried to point out the probable steps which led up to the invention of bronze. We can scarcely comprehend the difficulties which attended the labors of the primitive metal-workers. There were no books containing the wisdom of many, from which the investigator could draw his stores of knowledge. and the only way that knowledge could be disseminated was by word of mouth.
Now, when one man makes an important step in a discovery, hundreds of earnest workers, some, perhaps, in distant places, are quickly made aware of the fact, and extend its scope, or point out its imperfections, and thus hasten on the desired end. Then, each individual, or community, must, of necessity, have commenced at the beginning, and the discoveries made would hardly be perpetuated in the memory of others. There were so many obstacles to be overcome before a knowledge of bronze could be acquired, in the then existing state of human knowledge, that it must ever remain a source of wonder to us, at the present day, that it was invented at all.
We may picture to ourselves the ancient copper-worker, after numerous experiments, guided by some good genius, finally hitting on some process by which, from his mass of ore, he extracted a nearly pure piece of copper. Having learned how to reduce these ores, there are many ways in which it might have been found that a mixture of the two metals would form a new compound of greatly increased value.
It must have taken a long course of experiments to determine what proportions of each metal to use to make the best bronze. It is interesting to know that these early workers had learned the proportions of each to use, not varying a great deal from the results of modern research—that is, from ten to twelve per cent of tin. Bronze relics, no matter where obtained, whether in the Old or the New World, do not widely depart from this standard, and such instances as do would probably denote that the supply of tin became short. This uniformity of composition would imply that the art of making bronze was discovered in one place, from which it gradually spread over the globe.