SLAVE STEALING IN MISSOURI. - The Chicago Press and Tribune announces with a shout of exultation, that seventy-five fugitive slaves, from Missouri, passed through Grinnell, Iowa, on the 21st inst., on their way to Canada. They were well provided with weapons to defend themselves against pursuers. The negros were enticed from Missouri by abolitionists in Kansas, escorted through Nebraska to the Iowa line, and then shipped via the underground railroad to Chicago. The business is constantly going on, many trains of slaves, accompanied by their abolitionist conductors, passing through Iowa without announcement of its arrival. The farmers of Western Missouri feel severely the effect of these depredations, and it is not to be wondered at that they should inflict the most frightful vengeance on their enemies whenever they catch them. - St. Louis News.