The objective of the Fund is to track the performance of the U.S. Treasury (government) bond market. The Fund seeks to track the performance of the Bloomberg U.S. Treasury Bond Index (the Index) as closely as possible. The Fund invests primarily in securities included in the Index. These securities include U.S. government bonds and public obligations of the U.S. Treasury. In seeking to track the performance of the Index the Fund will use a stratified sampling strategy to build a representative portfolio. Consequently, the Fund will typically hold only a subset of the securities included in the Index. In limited circumstances the Fund may purchase securities that are not included in the Index.