Of the new Jefferson Physical Laboratory the Advertiser says: "The undergraduates will have access to the lecture room and general laboratory through a small entrance at the east end of the building and by a stairway removed as far as practicable from the rooms devoted to special investigations. This arrangement, and the placing of the engines and dynamos on the outside of the building, in a separate building to the eastward, will serve to prevent the jar of the machinery and the tramping of students from interfering with delicate observations. The basement of the central piece is occupied by receiving-rooms and storage for heavy pieces of apparatus. The western section is the one which the professors and instructors of physics have most carefully considered. The lower floor contains rooms of moderate size devoted to general use and special investigations, - rooms which will be fitted up with reference to electricity, heat, magnetism and sound. In each room of the first floor there are independent piers, built up from the basement, insulated from the walls and floors, upon which delicate instruments are to be placed. Similar rooms devoted to optics, electricity, and the Rumford laboratory are located upon the second story. The third floor is as yet assigned to no definite use, and, with the exception of a room for photography, can be left to meet the wants of the future. The basement of this section is occupied by a room for magnetism, one for heat, and one for weights and measures. A room for constant temperature is excavated below the basement floor in the centre of the building.