Tomorrow two courses in geological subjects will be given in the Rotch Building as a part of the University Extension work. These courses are conducted for two hours every Saturday; one of them in Mineralogy, held from 10 A. M. to 12 M., and the other Dynamical and Structural Geology, from 2 to 4 P. M. They are intended for those who wish to teach the subjects or use them in scientific work, or for those who wish a knowledge of them as a part of general education.

The class in mineralogy is taught directly from the minerals themselves. An individual tray of specimens of all minerals studied in the lessons is furnished each member of the class. By this means an intimate acquaintance is obtained with all the common minerals of the world, such as the ores from which gold, silver, copper, lead, etc., are procured, and the chief mineral constituents of rock, as granite, limestone, and sandstone. Lectures will supplement the work with specimens.

The classes in dynamical and structural geology is taught principally by lectures, which are amply illustrated by lantern slides, diagrams, and numerous specimens on the lecturer's table. The subject deals with the chemical and mechanical wear and waste of the land, the actions of rivers, waves, glaciers, and wind, the origin and formation of mountains, plateaus, and valleys, the origin, actions, and effects of earth-quakes and volcanoes.

Those who wish to count their work toward a college degree are required to take examinations. The courses continue for sixteen weeks, and the fee is merely nominal. The instructor in both classes is Professor George H. Barton, director of the Teachers' School og Science.