(                                     NGU13                                 )                                by Myra P. Saefong

SAN FRANCISCO (MarketWatch) -- Natural-gas futures lost more ground on Thursday after the U.S. Energy Information Administration reported a supply increase of 59 billion cubic feet for the week ended July 26. Analysts polled by Platts forecasted a climb between 54 billion cubic feet and 58 billion cubic feet. Total stocks now stand at 2.845 trillion cubic feet, down 368 billion cubic feet from the year-ago level and 34 billion cubic feet below the five-year average, the government said. September natural gas     (ngu13)   fell further, trading at $3.37 per million British thermal units, down 7 cents, or 2.1%. It was trading at $3.40 shortly before the data