"We are not surprised that the future supply of cotton should have engaged the attention of Parliament on an early night of the Session. It is a question the importance of which can not well be overrated, if we refer only to the commercial interests which it involves, or to the social comfort or happiness of the millions who are now dependent upon it for their support. But it has an aspect far loftier and even more important. At its root lies the ultimate success of a policy for which England has made great struggles and great sacrifices--the maintaining of existing treaties, and perhaps the peace of the world. Every year as it passes, proves more and more that the question of slavery, and even of the slave trade, is destined to be materially affected, if not ultimately governed, by considerations arising out of the cultivation of this plant. It is impossible to observe the tendency of public opinion throughout America, not even excepting the Free States, with relation to the slave trade, without feeling conscious that it is drifting into indifference, and even laxity. In every light, then, in which this great subject can be viewed, it is one which well deserves the careful attention equally of the philanthropist and the statesman. "It has been said, that in the case of cotton we have found an exception to the great commercial principle of supply and demand. Is this so? We doubt it. We doubt if, on the contrary, we shall not find, upon investigation, that it presents one of the strongest examples of the struggle of that principle to maintain its conclusions. No doubt the conditions of its production have made that struggle a severe one; but, nevertheless, it has not been altogether unsuccessful. Eighteen years ago, (in 1840) the total supply of cotton imported into this country was 592,488,000 lbs.: with temporary fluctuations, it had steadily grown until it had reached, in the last three years, upwards of 900,000,000 lbs., showing an increase of more than fifty per cent. Nevertheless, the demand had been constantly pressing upon the supply, the consumption has always shown a tendency to exceed the production, and the consequent result of a high price has, during a majority of those years, acted as a powerful stimulant to cultivation. But, practically speaking, we possess but two sources of supply, and both present such powerful obstacles to extended cultivation, that we are not surprised at the habitual uneasiness of those whose interests demand a continually increasing quantity. Those two sources are the United States and British India. It is true that Brazil, Egypt, the West Indies, and some other countries, furnish small quantities of cotton; but when we state that of the 931,847,000 lbs., imported into the United Kingdom in 1858, the proportion furnished by America and India was 870,656,000 lbs., leaving for all other places put together, a supply of only 61,191,000 lbs., notwithstanding the many laudable efforts, both on the part of