THE Wyperfeld National Park is situated about 300 miles north of Melbourne in the midst of the country known as the Mallee, which occupies about one fifth of the area of the State of Victoria. The soil of the Mallee varies greatly; but much of it, when cleared of the Mallee cucalypts, has proved excellent wheat country. The clearance was due to the invention of the stump jump plough and the roller. It varies greatly in quality, being in some places almost entirely sandy and in others fertile red soil. All of it is very liable to wind erosion, unless special precautions are taken to preserve both belts of euealypts and some surface vegetation, and so far these precautions have not been taken in general.