August 15, 1884.] 



SCIENCE. 



129 



prepare a difficult experiment much more read- 

 ily and completely, or to leave complicated 

 apparatus set up for some length of time. The 

 section has also a set of drawers containing 

 such operating instruments, glassware, towels, 

 etc., as are constantly required in the demon- 

 strations, a shelf below carrying sand-baths, 

 lamps, and the like. In the plan the movable 

 table (LT) stands in the laboratory, as when 

 waiting for its lecture-load. Behind the table 

 in the lecture-room are three sliding black- 

 boards (B), 280 centimetres long and 120 

 centimetres wide, which run up and down in 

 front of a small hood (H), communicating 

 also with the adjoining chemical laborator}^. 

 In this way unpleasant smells or noxious 

 gases are easily avoided ; and apparatus 

 may be set up while the lecture is going 

 on. Along the upper edge of each black- 

 board is a small brass rod, which has been 

 found convenient for suspending diagrams 

 and tables. Below are cupboards for fur- 

 ther lecture-supplies, four electric bells be- 

 ing placed at the side to summon various 

 persons whose help ma} T be required dur- 

 ing the lecture. The seats slope upward 

 with a gradually increasing pitch (in ac- 

 cordance with the rule of construction given 

 by Lachez) , so that each person in the audi- 

 ence has an equally good opportunity of 

 seeing over the heads of those in front of 

 him. 1 Above the seats is a broad platform 

 or gallery leading to the entrances for stu- 

 dents, and corresponding to the mezzanine 

 of the floor. At the back of this gallery 

 the windows are provided with shelves for 

 such microscopical demonstrations as the 

 lectures require. The room is lighted al- 

 most entirely from windows in the eastern 

 and southern gallery ; but, as the lectures 

 for which the room was planned are usually 

 delivered in the morning, no difficulty has 

 arisen. A large chandelier has been found 

 sufficient for the later hours of the winter 

 afternoons and in the evening. A beam of 

 light may be brought into the lecture-room by 

 placing a heliostat on the shelf (US) of the 

 proper window in the southern wall of the 

 building, and this ray can also be carried into 

 the laborator} T . At present no arrangements 

 have been made to darken the lecture-room 

 for lantern demonstrations ; but this can be 

 easily done, should it become desirable. 



A small ante-room at the side opens both into 

 the main hall and the general laboratoiy. The 

 latter is a large room (10.8 by 9.6 metres) and 



1 See Czerraak : Ueber das physiologische privat-laboratorium 

 an der Universitat Leipzig. 1873. 



of the full height (6.25 metres) of the story. 

 Light is furnished by three large windows in 

 the eastern wall, and by the five windows of 

 the gallery at the northern end (see fig. 2). 

 As the partition-wall which shuts off the small 

 rooms is partly of glass, the light-supply is 

 ample. A general view of this room and of 

 the galley, taken from a point near the door 

 of the weighing-room, is given in fig. 3. The 

 arrangement of the working-tables ( WT) is 

 evident from the plan. Those along the walls 

 are firmly fixed in position, as is also the mid* 

 die table adjoining the interrupter-case (IC) : 

 the other working-tables can be moved as re- 

 quired. Two chemical tables (C7 7 ), with the 



Fig. 2. — Half story. 



necessary shelves and chemicals, bowls, and 

 filter-pumps, furnish places for from six to 

 eight students in the practical courses or for 

 special work. The working-tables adjoining 

 the kymographion (Kn) and interrupter-case 

 (IC) can be extended to the long table below 

 the windows by a board, which is hooked into 

 position as needed. In this way it is possible 

 for two persons to operate in the most favora- 

 ble light and position. The cases holding the 

 operating instruments (01) will be seen to be 

 very conveniently placed against the wall near 

 the operating-table : at the side are shelves 

 containing the ether, morphia, curare, etc., 

 likely to be required. 



The ventilation of this room, like that of tli3 



