SCARLET PASS CROSSROADS, Sept. 18th, 1841. — Word has reached this remote outpost of a gathering storm in the great capitals of Europe. The Anti-Corn Law League, that formidable association of Manchester manufacturers and London pamphleteers, has extended its campaign beyond the British Isles. Their emissaries, bearing printed tracts and the fiery rhetoric of Mr. Richard Cobden, have been observed in the coffee-houses of Calais, the counting-houses of Antwerp, and even the salons of Paris. They argue that the bread of the poor is taxed to enrich the landed gentry, and that free trade would bri…