PUZZLE OF MYSTERY CORN CIRCLES In the quiet of a Hamnshire. field, the phenomenon. of pr cise circles..of flattened corn which has been puzzling scien tists for more than a decade bas appeared again... The mysterious circle in the wheatfield at the Devil's Punch- bowl, near Winchester, mea- sures 68 feet in diameter and-is bounded by another ring four feet wide, five feet from the ci cle's outer edge. Over the years, the circles. which appear in several parts of England and overseas, have been said to be caused by visits from space, freak weather con- ditions, druid ceremonies or electro-magnetic fields.