The Jutland and Sleswick pirates, who fourteen centuries ago performed the great achievement of conquering and colonizing Britain, have since, in the persons of their descendants, achieved the still greater feat of colonizing and settling, while they are in a fair way of conquering and occupying, a whole continent, to the destruction or absorption of every other race. The Anglo-Saxon population of America, in fact, constitutes, at this moment, a people more numerous and mighty than any European nation of the period when their emigration commenced. The very same people is now engaged in achieving another great, although not equally great enterprise, the colonization of another continent, Australia; and the Australian colonies, within sixty years of their first foundation, are already calling loudly for self and responsible government, which is, by more than a century, sooner than the American Colonies made a similar claim. We have not the least doubt but that it will be to the mutual and permanent advantage of both parties, that these demands of the Colonists, which are in no respect unreasonable, should be liberally and readily granted. The better to understand our position in relation to them, let us compare the two continents alluded to. America has a greater extent of territory, and therefore more room for expansion than Australia. Its natural products are more valuable, its soil is more fertile, and its climates more varied and propitious to vegetation. Its greatest superiority over Australia, however, consists in its magnificent water communication--its great rivers, its splendid lakes, its navigable estuaries, and its commodious harbors. Finally, it possesses the vast advantage of being only one-sixth part of the distance that Australia is from the civilization and markets of Europe. Let us now see what Australia is. It is said to contain three millions of square miles. But of this we take it that about one-half, or all of it that lies north of the twenty-fifth degree of south latitude, is unfit for our use as Europeans, and, most probably, for the profitable use of any people, on account of the comparative sterility of the land, or, what in such a situation is equivalent to sterility, the drought of the climate. But for these great and, we fear, insuperable disadvantages, the tropical portion of Australia might have been peopled from industrious and teeming China, which, with the help of steam navigation, is at an easy distance. Notwithstanding this serious deduction from its available area, Australia has extent enough for the abode of a great people, as what remains is equal to near twenty Britains, or above seven countries as large as France!