America laughs at the whole crew of Manchester conspirators with sovereign and undisguised contempt. She wants nothing from them--she will take nothing from them. Secure in her own position, and possessing within herself every requisite for greatness, and--what is more--for the happiness and welfare of her children, she regards with scorn the attempted compromise of the crippled converters, and, while she rejects their offer, gives them a burning rebuke for their treachery to their native land. So far from discouraging her manufactures, she intends to protect them; so far from concealing her mineral wealth, she has resolved to develop that to the utmost--judging, and rightly judging, that it is alone through the "harmony of interests" that a nation can be truly prosperous. Her rebuke, as contained in the documents before us, which we firmly believe convey the sentiments of the wisest men of the Union, is perhaps the most poignant that ever was cast in the teeth of a civilised and Christian community. It resolves itself into this:-- "You, producers, mechanics, and artisans of Great Britain, who are deprived of your labour, which is your only heritage, for the sake of a few men, who will neither take your produce nor avail themselves of your skill, come to us. We require hands to till our savannahs, to excavate our ores, to work at the furnaces, to weave, and to spin. Labour with us is not as in your country. The producer shall not be sacrificed for the sake of the converter, or the converter subjected to the precarious mercy of the producer of another land. Here, at least, you will find an entire harmony of interests. Foreign customers you need seek none, for every requisite of life is secured to you in return for your labour." And, lest it should be thought that we are putting words into the mouth of the Americans without authority, we shall presently have occasion to quote from the remarkable work before us. The repeal of the Corn Laws, and of the duties levied on provisions, have enormously, as we all know, increased the exports of America. The following tables will show their amount, and, in the case of provisions, the increase since the lowered tariffs came into operation. AMOUNT OF AMERICAN EXPORTS OF GRAIN AND PROVISIONS. GRAIN AND FLOUR. Flour. Wheat. Corn. Cornmeal. Year ending barrels. bushels. bushels. bushels. June 30, 1848, 958,744 1,531,000 5,062,000 226,000 Aug. 31, 1849, 1,114,016 4,684,000 12,721,000 88,000 PROVISIONS. Beef. Butter. Cheese. barrels. lb. lb. 1840, 19,631 1,177,639 723,217 1841, 56,537 3,785,983 1,748,471 1844, 106,174 3,251,952 7,342,145 1849, 133,286 3,406,242 17,433,632