Last night the dollar fell to a historic low against the Japanese yen, but recovered during the day to reach level's equal to last Friday's . . . Dow Jones industrial average regained 48.56 points, closing at 3,685.50 . . . N.Y.S.E.'s composite index up1.90 to 246.45 . . . NASDAQ Stock Market composite index jumped 8.90 to 702.69 . . . American Stock Exchange down 0.86 to 425.44 . . . Gold fell $6.40 to $384.70 on the Commodity Exchange in New York . . . The 30-year Treasury bond closed with a yield of 7.46 percent, down from 7.51 late Friday.