The expansion of the new Celtic consciousness is exemplified in the publication in 1804 of a tract in French on the Irish Alphabet by Jean Jacques Marcel. The first important philological treatise on the Celtic languages was published by the French philologist Pictet in 1837, dealing with "the affinity of the Celtic languages to Sanscrit." Next year, 1838, appeared Bopp's work in German, showing the relation of the Celtic languages to Sanscrit, Zend, Greek, Latin, German, etc. The Celtic literary enthusiasm was henceforth supplemented by solid scientific research.
In these particulars is presented, I think, a fairly accurate sketch of the wholly modern development of the Celtic consciousness. I wish to recall here the fact that from the earliest traceable traditions of the Gaelic people down to the time of George Buchanan, there is not found the slightest glimmer of recognition that the Celts of Ireland were Celts, or that they were more nearly akin to the Celts of Britain and the Continent than to any other population of white men. The second fact which I wish particularly to emphasise is that throughout all its history the term Celtic bears a linguistic and not a racial significance.
It need hardly be re-stated here that the Celts are a linguistic offshoot of a prehistoric people whose descendants—also in the line of language—comprise many ancient and modern populations in Europe and Asia. It would be out of place now to discuss the central location from which the various branches of this prehistoric people spread themselves over so wide an area. Indeed, it is a facile and fanciful assumption to suppose that the spreading took place from one central habitat. It is enough to say that, whereas the earlier philologists took for granted that the original population, before its division into various linguistic groups, was located in Western Asia, the later philologists are strongly inclined to place its home in Europe, in the region south-east of the Baltic Sea.
The oldest known geographical descriptions of Europe are those of Hecatæus, who flourished about 500 years before the Christian Era, and Herodotus, about half a century after him. Their knowledge of the European mainland, north of the countries bordering on the Mediterranean and its inlets, was of the most vague and general kind. They divided the whole of northern and middle Europe between two peoples, the Scythians in the eastern, and the Celts in the western parts. They also knew of the Iberians in the south-west, in the Spanish peninsula and the adjoining parts of France. Herodotus, however, recognised to the west of the Celts a people whom he calls Kunēsioi and Kunētai, and in the furthest north of Europe a population distinct from the Celts and Scythians, but unknown to him by any name of their own, for he calls them Hyperboreans, i.e., out and out northerns. In the time of Eratosthenes, about 200 B.C., this knowledge does not appear to have been very much increased among the Greeks. They knew, however, of the existence of the islands of Ireland, which they called Ierne, and Britain, which they called Albion, and also of a country beyond the Baltic; but they still divided the northern mainland of Europe between the Celts and the Scythians.
I have already remarked how ancient Irish tradition ignores the Celtic origin and affinities of the Irish. We may go farther and say that our ancient writers, when they set about exploring the geographical knowledge of the world that came to them in Latin writings, had it very definitely in their minds that the Irish were not of Celtic origin; for, of the three great populations of northern and western Europe known to the oldest classical writers—the Iberians, the Celts, and the Scythians—they excluded the Celts, and included the other two, some selecting the Iberians and others the Scythians as the ancestral people from which the Gaels were descended.
The reason why to the Greek mind, in the early centuries of history, the Celts appeared to occupy so much of Middle Europe and to occupy it so exclusively, was I think this: the Celts at that time actually occupied the upper valleys of the Danube, the Rhone, the Rhine, and the Elbe, and the high ground between. These rivers were the principal highways of such transcontinental commerce as then existed, and this commerce was probably considerable, comprising various metals, salt, amber, etc. Whatever came and went in the course of transcontinental trade from north-western Europe to the Mediterranean countries followed trade routes which lay through the central region north of the Alps, and all this region was held by the Celts. In this way, the Celts seem to be more extensively spread over northern middle Europe than they actually were.
Archæology takes us back farther and tells us more than history in relation to the Celts while they were as yet, so far as we know, located solely or mainly in the mid-European region to the north of the Alps. It is not questioned that the ancient cemetery discovered and explored many years ago at Hallstatt in Upper Austria belonged to Celts and that the curious remains of art and industry found there are the work of a Celtic people. The period assigned for that work begins in the ninth century before the Christian Era and may extend onward for several centuries. The discoveries indicate an organised and progressive community, among whose resources were agriculture and the working of mines for metals and salt; but the principal fact disclosed is that, already in that early time, the Celts were acquainted with the use and manufacture of iron. In the northern parts of Europe, in Scandinavia, Britain and Ireland, as archæologists are agreed, the Iron Age did not make its appearance until several centuries later.
We need not doubt that it was this possession of iron in abundance and of skill in its manufacture, at a time when neighbouring peoples found in bronze the highest class of material for their implements of industry and war, that gave the Celts the power and prosperity which they long enjoyed in Mid-Europe and enabled them to conquer and colonize all the countries that surrounded them.
One effect of the mastery of iron, for a people occupying an inland region with small facilities for water-traffic, was that the Celts acquired a notable skill in the making of vehicles. From them in a later age the Romans borrowed the names of nearly every variety of wheeled vehicle that the Romans used: carrus or carrum, carpentum, esseda, rheda, petorritum. From this it obviously follows that the Celts were also great road-makers. During the nine years that Julius Cæsar spent in the conquest of Transalpine Gaul, and marched his legions in every direction over that vast region, it is quite evident that he was operating in a country already well supplied with roads.