Half of the third floor is occupied by the elementary physical laboratory, a room admirably adapted for experiments not requiring extremely stable foundations. The remainder of the floor is devoted to the photographic room, the wet laboratory, and the civil engineering-drawing room. The latter is a lofty and finely-lighted room and is equipped with about forty drawing tables, a large blue-printing frame, and an electric light-tracing table. Here are carried on the courses in Roofs and Bridges, and allied structural subjects, as well as work in plotting and topographical drawing when inclement weather keeps the surveying classes indoors. Way up under the ridgepole of the building is a narrow room one hundred feet long, known as the " grave yard," a room not open to students or the public. Here awaiting a possible day of resurrection, reposes a great variety of old apparatus and material such as patterns and parts of machines, arc lamps, broken files of scientific publications, all the blue prints of the old Hinckley Locomotive Works, and much of the apparatus developed in Professor Dolbear's researches in telephony.

J. I.T.