Wall Street had another astounding advance Tuesday, with the Dow Jones industrials soaring nearly 900 points in their second-largest point gain ever as late-day bargain hunters stormed into the market. The Dow and the Standard & Poor’s 500 index each shot up nearly 11 percent.

There didn’t appear to be any one catalyst for the surge that saw the Dow nearly double its gain in the last hour of trading. Many analysts said investors were grabbing up stocks in the belief that Wall Street had fallen too far in recent sessions; the Dow had dropped 500 points in two days. Some said buying early in the day came from anticipation of an interest rate cut Wednesday by the Federal Reserve, and the market just followed its recent pattern of building on its gains or losses in the last minutes of the session.

But given the relentless volatility in the market – out of 20 trading days this month, there have been only two that didn’t see the Dow close up or down in triple digits – no one expects that stocks are now headed higher for good. After Wall Street’s devastating

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