CHARACTERS THAT APPEAR IN THIS STORY.
Reading edition
Motor Matt, a lad who is at home with every variety of motor, and whose never-failing nerve serves to carry him through difficulties that would daunt any ordinary young fellow. Because of his daring as a racer with bicycle, motor-cycle and automobile he is known as "Mile-a-minute Matt." Motor-boats, air ships and submarines come naturally in his line, and consequently he lives in an atmosphere of adventure in following up his "hobby."
Dick Ferral, a young sea dog from Canada, with all a sailor's superstitions, but in spite of all that a royal chum, ready to stand by the friend of his choice through thick and thin.
Carl Pretzel, a cheerful and rollicking German boy, stout of frame as well as of heart, who is led by a fortunate accident to link his fortunes with those of Motor Matt.
Captain Nemo, Jr., otherwise Archibald Townsend, a fast friend of the Motor Boys and skipper of the submarine, Grampus.
Cassidy, mate of the Grampus.
Gaines, Clackett and Speake, crew of the Grampus.
Captain Jim Sixty, a seaman of long experience who resorts to filibustering in order to gain big prizes in the lottery of Fortune. Master of the wrecked brig, Dolphin.
Ysabel Sixty, Captain Sixty's daughter, who plays an ignoble part, although against her better nature.