In each of those great primitive stocks, an all-wise Providence introduced a large number of sub-races, if we may be allowed to call them so, out of which are sprung the various nations whose intermingling forms the web of human history. Our object is to consider only the Celtic branch. For, whatever may be the various theories propounded on the subject of the colonization of Ireland, from whatever part of the globe the primitive inhabitants may be supposed to have come, one thing is certain, to-day the race is yet one, in spite of the foreign blood infused into it by so many men of other stocks. Although the race was at one time on the verge of extinction by Cromwell, it has finally absorbed all the others; it has conquered; and, whoever has to deal with true Irishmen, feels at once that he deals with a primitive people, whose ancestors dwelt on the island thousands of years ago. Some slight differences may be observed in the people of the various provinces of the island; there maybe various dialects in their language, different appearance in their looks, some slight divergence in their disposition or manners; it cannot be other wise, since, as we have seen, no two individuals of the human family can be found perfectly alike. But, in spite of all this, they remain Celts to this day; they belong undoubtedly, to that stock formerly wide-spread throughout Europe, and now almost confined to their island; for the character of the same race in Wales, Scotland, and Brittany, has not been, and could not be, kept so pure as in Erin; so that in our age the inhabitants of those countries have become more and more fused with their British and Gallic neighbors. We must, therefore, at the beginning of this investigation, state briefly what we know of the Celtic race in ancient times, and examine whether the Irish of to-day do not reproduce its chief characteristics. We do not propose, however, in the present study, referring to the physical peculiarities of the Celtic tribes; we do not know what those were two or three thousand years ago. We must confine ourselves to moral propensities and to manners, and for this view of the subject we have sufficient materials whereon to draw. We first remark in this race an immense power of expansion, when not checked by truly insurmountable obstacles; a power of expansion which did not necessitate for its workings an uninhabited and wild territory, but which could show its energy and make its force felt in the midst of already thickly-settled regions, and among adverse and warlike nations.