NIAGARA AND THE SARATOGA. • In point of strength, speed and tlni-h, fli-t public will siMm discover that tlu-y are unefpiall ed, and in command of experienced ami skillful ; seamen, viz: Captains GEORGE W. COUCH and IA. L. KING. The Pursers are well known tothe community, viz : Messrs. WILLIAM o. snd .1. H. SMITH. •