Effort has been made by the editor to bring together in one volume a number of such stories, not for the reason alone that there might be another Jack London book for boys, but also in order to add to our juvenile literature a volume likely "to be chewed and digested," as Bacon says, a book worthy "to be read whole, and with diligence and attention." For my belief is that boys read altogether too few of such books. Or perhaps it would be more correct to say, have too few opportunities to read such books, because so often we fail to see how quick in their reading their minds are to grasp the more difficult, and how keen and competent their conscience to draw the right conclusion when situations are presented wherein men err so grievously.Boys delight in men who have had adventures, and when they are privileged to read of such exploits in thrilling story form, that is the "seventh heaven" for them. Such a "boys' man" was Jack London, whose whole life was one of stirring action on land and sea.