-Theiew Orleans Delta speaks of a slave in Hint piace, possessed of extraordinar power Ã³f menlal cnlculation. II is owner has begun publicly to exliibit him, mak mg a living by Iho brains of tfio poor fullow. - Cincinnati paper. We wonder ifh wiJI nÃ³t son.e day "calcÃºlale" l,ow far il is to a land of freedom, leaving his rnaster to "ealculate" iow he may get his living in somo honest vay? ffThe letter of our New York corespondenl in Ihis papor, we think will iierest our roaders.