Such is the description of these singular structures--when and by whom built? Their number must have been very great indeed; for although there have ever been decay and abstraction of the materials for common purposes going on, there are now upwards of three thousand in existence; yet, not one has been built during the last 2500 years. Not only is the inquiry, by whom, and when were they erected, but for what purpose? On all these points, various opinions have been given. Mr Tyndale, who has well weighed all that has been written on the subject, is of opinion that they were built by the very early Canaanites, when, expelled from their country, they migrated to Sardinia. There are visible indications of other migrations of the Canaanites, but nowhere are exactly, or even nearly similar buildings found. We know, upon the authority of Procopius, that in Mauritania were two columns, on which were inscribed in Phoenician characters, "We are those who fled from the face of Joshua, the robber, the son of Nane." There is certainly a kind of similarity between these buildings and the round towers of Ireland--a subject examined by our author; but there is also a striking dissimilarity in dimensions, they not being more than from eight to fifteen feet in diameter. But there is a tumulus on the banks of the Boyne, between Drogheda and Slane, which in its passages, domed chambers, and general dimensions, may find some affinity with the Sarde Noraghe. It certainly is curious that an opinion has been formed, not without show of reason for the conjecture, that these people, whether as Canaanites, Phoenicians, or Carthaginians, reached Ireland; and it is well known that the single specimen of the Carthaginian language, in a passage in Plautus, is very intelligible Irish. It has been observed that when Cato, in the Roman senate, uttered those celebrated and significant words, "Delenda est Carthago," he was unconsciously fulfilling a decree against that denounced people. We should be unwilling to trace the denunciation further. There are, however, few things more astonishing in history, than that so powerful a people as the Carthaginians were--the great rivals of the masters of the world, should have been apparently so utterly swept from the face of the world, and nothing left, even of their language, but those few unintelligible (unless they be Irish) words in Plautus.