The fact is, that the ruins of a few unimportant castles and churches are all the landmarks that remain of the Danish domination in Ireland; and even these must have been the product of the latter part of it. But a more curious proof of the extirpation of every thing Danish in the island is afforded by Mr. Worsaae, whose object in writing his account of the Danes and Norwegians in England, Scotland, and Ireland, was to glorify his own country, Denmark. He made a special study of the names of places and things, which can be traced to the Scandinavians respectively in the three great divisions of the British Isles; and certainly the language of a conquering people always shows itself in many words of the conquered country, where the subjugation has been of sufficient duration. In England, chiefly in the northern half of the kingdom, a very great number of Danish names appear and are still preserved in the geography of the country. In Mr. Worsaae's book there is a tabular view of 1,373 Danish and Norwegian names of places in England, and also a list of 100 Danish words, selected from the vulgar tongue, still in use among the people who dwell north of Watling Street. In Scotland, likewise--in the Highlands and even in the Lowlands- -a considerable number of names, or at least of terminations, are still to be met in the geography of the country. Three or four names of places around Dublin, and the terminations of the names of the cities of Waterford, Wexford, Longford, and a few others, are all that Mr. Worsaae could find in Ireland. So that the language of the Irish, not to speak of their government and laws, remained proof against the long and persevering efforts made by a great and warlike Northern race to invade the country, and substitute its social life for that of the natives. As a whole, the Scandinavian irruptions were a complete failure. They did not succeed in impressing their own nationality or individuality on any thing in the island, as they did in England, Holland, and the north of France. The few drops of blood which they left in the country have been long ago absorbed in the healthful current of the pure Celtic stream; even the language of the people was not affected by them. As for the social character of the nation, it was not touched by this fearful aggression. The customs of Scandinavia with respect to government, society, domestic affairs, could not influence the Irish; they refused to admit the systematic thraldom which the sternness of the Northmen would engraft upon their character, and preserved their free manners in spite of all adverse attempts. In this country, Turgesius, Amlaf, Sitrick, and their compeers, failed as signally as other Scandinavian chieftains succeeded in Britain and Normandy.