Alarmists point to the sparks in the cotton fields of America, while thoughtful men reflect that the commercial prosperity of this great country hangs upon a thread of cotton, which a blight of the plant, an insurrection among the slaves, an untimely frost, or an increased demand in the Northern States of the Union, might destroy; bringing to Lancashire first, and then to the whole kingdom, a return of the Irish famine of 1847, which reduced the population of that portion of the kingdom from eight to six millions. * * * * * The Southern States of the American Union are following the example of the infatuated Louis the Fourteenth of France. As he drove into exile thousands of his subjects engaged in manufactures and trade, who sought refuge in England and laid the foundation of our manufacturing supremacy, so are the Slave States now driving from their confines thousands of freed colored men. Where are the exiles to go? The Free States are too crowded, and Canada too cold for them. Can we not offer them an asylum in Jamaica and other colonies? They are the cream, the best of their race; for it is by long-continued industry and economy that they have been enabled to purchase their freedom, and joyfully will they seize the hand of deliverance which Great Britain holds out to them. We only want additional labor; give us that, and we shall very soon cultivate our own cotton.--_Slavery Doomed._ * * * * * FUGITIVE-AID SOCIETY IN CANADA At a meeting held in the Town Hall, Manchester, on the 8th of August inst., the following remarks were made by Thomas Clegg, Esq., who presided on the occasion.