Prize Essays.

The American Meteorological Jourual has decided to offer the following prizes: For the best original essay on tornadoes, or description of a tornado, $200 will be given. For the second best $50. Among those especially worthy of mention $50 will be distributed. The desire is to especially direct the attention of students to tornadoes. in hopes that valuable results may be obtained. The offer is open to all collegiate students of the United States, and the essays must be sent before July 1, 1889, either to Professor Harrington, Astronomical Observatory, Ann Arbor, Mich, or to A. L. Rotch, Blue Hill Meteorological Observatory, Readville, Mass. They must be signed by an assumed name, and must be sent with a sealed letter enclosing the assumed name and the real name and address. Three competent judges have been selected to award the prizes. All essays sent are to be considered the property of the paper and may be published.