A Boabdixo-House Thief.— A youthful looking, sanctified fellow, sailing under the names of John Kennedy, alias Samuel Smith, was locked up in the lower station-house yes terday afternoon for stealing bed-clothing from the " National Hotel," on Broad street, between Ninth and Tenth. About four days since he came to the city, and sought new lodg ing-places each night. Monday night he pre sented himself at the "National," and paid