BOXING.IF—•lack Johnson were not. a heavyweight champion he would be a cotton carrier;Ad Wolgast would be a bootblack;Packey McFarland a butcher boy;M. Gibbons a railroad f llow;A1 Palzer a fine boilermaker;K. O. Brown a hot-dog peddler;Johnny Kilbane a nice little clerk, wearing neckties to match his socks and hatband.Joes Rivers, the Los Angeles aspirant for the lightweight championsip, is the latest victim of Joe Mandot, the little Frenchman from New Or-