(MONEY Magazine) – -- The December Tax Letter mistakenly stated the rules for writing off casualty losses. Tax law allows deductions only up to the original cost of your property, plus the cost of pre-disaster improvements. -- A comment in the February 1990 story ''Great Moves to Make Your Savings Grow'' was incorrectly attributed to John Connolly, senior vice president of equity research at Dean Witter. Connolly believes that interest rates will drop as much as one percentage point by summer and remain low for the rest of the year.