In a recent letter from Rev. W. King, of Buxton, C. W., alluding to the case of Anderson, he says:—'Things look rather serious in the United States. The slave power is at the culminating point; but it will not die without a hard struggle. The struggle may be longer than we expect, but it will soon come to an end if all the slave States secede. I hope the North and West will stand firm. Slavery has been trying to extend its power into Canada, in the demand made for the rendition of Anderson by the State of Missouri. But although two of our Judges in the Court of Queen's Bench have decided in favor of the slave power, he will not be given up. The British law is against it, and British hearts are against it. The meeting lately held in Toronto, and others of a similar kind now holding over the Province, show the disapprobation of the public with the late judicial decision. These meetings speak the British feeling, and tell the minions of the slave power that we will not allow a British Province to be a hunting ground for fugitive slaves, and that Canada will not worship the golden image which the have set up.'