THE PILOT'S INADVERTENT CLOSURE (DEACTIVATION) OF THE MIXTURE CONTROL, WHICH RESULTED IN A LOSS OF ENGINE POWER, AND HIS FAILURE TO MAINTAIN SUFFICIENT AIRSPEED, WHICH RESULTED IN AN INADVERTENT STALL. FACTORS RELATED TO THE ACCIDENT WERE: THE GUSTY WIND, AND THE PILOT'S APPREHENSION OF EXISTING CONDITIONS.