the man kept the company of a large sack out of which he produced a fat ripe orange , wonderful and round , scherzo thence staining thumbnails to peel , dripping juice and river on what appeared to be a map of roads but was in fact a map - crumpled and marked with slashes of vague pencil - of watercourses , brooks and streams , folded after a shake and a snort and returned to the sack from where it , like the marvellous fruit , had sprung .