Natural-gas prices fall on rise in supply                                                                 (                                      NGM13                                 )                                                                  by Myra P. Saefong                            

SAN FRANCISCO (MarketWatch) -- Natural-gas futures lost more ground on Thursday, after the U.S. Energy Information Administration reported an 88 billion cubic foot increase in U.S. inventories for the week ended May 3. Analysts polled by Platts forecasted a climb between 86 billion cubic feet and 90 billion. Total stocks now stand at 1.865 trillion cubic feet, down 737 billion cubic feet from the year-ago level and 99 billion cubic feet below the five-year average, the government said. June natural gas     (ngm13)   was at $3.91 per million British thermal units, down 7 cents, or 1.8%. It was trading at $3.95 shortly before the data