By James Cordier and Michael Gross The short and abrupt rally in natural gas prices off of multi-year lows appears to be coming to an end. Natural Gas prices have been severely depressed in 2009, as a combination of slack industrial demand and burgeoning supplies drove prices to 7 year lows last month. While the September rally to $5.75 per mbtu may have caught some traders off guard, those familiar with seasonal tendencies are more than likely shaking their heads in recognition.