shares of george weston ltd wn slid 191 to c17335 thursday in what proved to be an allaround poor trading session for the canadian market with the sptsx composite index gsptse falling 146 to 1960063 george weston ltd closed c810 short of its 52week high c18145 which the company reached on december 13th trading volume of 270534 shares eclipsed its 50day average volume of 169483