Miss Merrill's tenth annual collection of ""Speculative Fun"" is a stunning, assortment of ""exercises in original thinking."" Particularly thought provoking are J.G. Ballard's mood piece-The Terminal Beach, Frank Roberts' view of future television-- It CouLd Be You and Russell Baker on people and machines today in A Sinister Metamorphosis. Then there's sheer entertainment in Rick Raphael's Sonny, the saga of a telepathic mountain boy in the army and in the touching end of Kit Reed's Automatic Tiger. Alfred Jarry has a weird new twist on The Power of Positive Thinking and Isaac Bashevis Singer's parable Yachid and Yechida is not to be missed. And there's lots more. Miss Merrill has given us a decade of consistent quality. Her anthologies are always superior and this one is outstanding.