It would be in vain for us, within the limits of an article, to attempt even the faintest sketch of the speculative manias which, from time to time, have affected the prosperity of Great Britain. Some of these have been quite, as baseless as the South Sea bubble, and may be directly traced to the agency and instigation of the Stock Exchange. Others were founded upon schemes of manifest advantage to the public, and even to the proprietary, if cautiously and wisely carried out; but here again the passion for gambling has been insanely developed, and encouraged by those who sought to make fortunes at the expense of their dupes. There is at all times, in this country, a vast deal of unemployed capital, which, in the cant phrase, "is waiting for investment," and which cannot well be invested in any of the ordinary channels of business. The fact is, that within the area of Britain, it has been long difficult for a capitalist to select a proper field of operation; and the tendency of recent legislation has materially increased the difficulty. The country, in fact, may be considered as entirely _made_. Agricultural improvement, on a large scale, which implied the possession of a tract of unprofitable country, was considered, even before the repeal of the corn laws, as no hopeful speculation. Since that disastrous event, the chances have naturally diminished; and we suspect that, by this time, very few people have any faith in Sir Robert Peel's proposal for establishing new colonies in Connaught. When we find the Whig Lord Monteagle denouncing free trade as the bane of Ireland, we may be sure that few capitalists will sink their funds in the western bogs, hoping that they may appear again in the shape of golden grain which may defy the competition of the fertile valleys of America. We have quite enough of factories for all the demand which is likely to come for years: instead of building new ones, it is always easy, if any one has a fancy for it, to purchase abandoned mills at a very considerable discount; but we do not find such stock eagerly demanded in the market. Foreign competition has extinguished several branches of industry to which capital might be profitably applied, and materially injured others; so that moneyed men really are at a loss for eligible investment. This want has been felt for a long time; and the uncertain policy of our ministers, with regard to colonial affairs, has undoubtedly had an injurious effect upon the prosperity of these dependencies. We have annihilated much of the capital invested in the West Indies, and have withdrawn a great deal more. It is long since Adam Smith urged the propriety and the policy of identifying some of our more important colonies with Great Britain, by the simple process of incorporation, thus extending materially the field of the capitalist upon security equal to that which he can always command at home. Such an opportunity is at this moment afforded by Canada; but it seems