Further episodes--some characteristically sly, each one engaging--in the delicately balanced friendship of portly hippos George and Martha. In "The Box," Martha succumbs to temptation--and George doesn't blow her cover. ("'You don't think I opened that little box?' said Martha. 'Of course not,' said George.") "The High Board" finds George quaking--and Martha covering (with a splash) for him. "The Trick" he plays on her then prompts her to do him one better--with, however, a ruse that echoes the first story's box full of jumping beans. The cleverest turnabout comes in "The Job": swimmer Martha warns lifeguard George to be "very strict," to allow "no horsing around"--and then blows up when he's strict with her. ("Martha was right--this is a hard job?') Tops for gentle give-and-take is "The Book"--where George, fleeing Martha's interruptions, reads that "Sometimes we are thoughtless without even knowing it." He goes to find her; she disarmingly apologizes;they both confess their loneliness. The magic, as always, is the economy of means.