P228 CEEFAX 228 Tue 8 Jul 21:07/03  CEEFAX FAMILY FINANCE  BOOKS PAGE  AN INTRODUC$JON TO FUTURES TRADING JF Blitz Macdonald & Evans/69 pages/£2.25 Futures have a present-day topicality, what with the Hunts' silver losses and moves to widen the scope of London's futures markets. This little book, which concerns itself strictly with the mechanics of this type of trading, is aimed at the commercial buyer. The rfsult is a field guide for the uninitiatf, wherf such puzzling terms as hedging, backwardation, calls and puts arf carffully pinned down.