With quick presence of mind, Mr. Choate at this moment let drive another harpoon, which found lodgment in the monster's flat head, and away it dashed again with the greatest vigor.  As there was now a line leading to each side of the devil-fish's body, those in the motor-boat found they were able actually to drive their captive as if it were a runaway horse, a gradual bearing on one "rein" or the other tending to direct the uncertain creature in that direction.  Thus very adroitly they swerved the huge fish toward the now distant shore of Bimini, hoping to master it in the shallower waters of the isle.