Last summer funds were appropriated by the Executive Committee of the Board of Curators for the erection and equipment of a small magnetic observatory at Rolla. The Observatory will consist of a set of three magnetic variometers which will give a continuous record of the variations in the horizontal intensity, the vertical intensity, and the declination of the Earth's magnetic field. These instruments will be housed in a variation-building which will be about 15 by 18 feet outside dimensions, well thermally insulated, and of completely non-magnetic construction. Also there will be an absolute building about eight by eight feet outside dimensions of non-magnetic construction and containing masonry piers on which instruments for measuring the absolute value of the strength and direction of the magnetic field may be set. The foundation- and pier-footings for the variation-building have been poured and the variometers have been purchased. It is planned to construct the absolute building immediately but funds are not now available for the absolute instruments.