...ss quite as well as Mr. John Mitchel understands it; and if they are satisfied that a given course of action will not be profitable, they cannot be expected to engage in it simply to gratify him. Mr. Mitchel propounds a theory of negro-importation in a gay, rollicking, humorous spirit, in which the blood-thirstiness of the thug is agreeably dashed with the overflowing humor of the Hibernian. He is espe...