The date is between twenty and thirty years ago. The place is an English sea-port. The time is night. And the business of the moment is--dancing. The Mayor and Corporation of the town are giving a grand ball in celebration of the departure of an Arctic expedition from their port. The ships of the expedition are two in number- -the Wanderer and the Sea-mew. They are to sail (in search of the Northwest Passage) on the next day with the morning tide.