268 



SCIENCE. 



[Vol. XIX. No. 484 



supplies steam for laboratory uses, beside heating the build- 

 ing. It is inclosed in brick, and air is brought into the en- 

 closed space through an outside flue and carried to the quan- 

 titative laboratory above, which is sufHciently warmed by 

 this means even in the coldest weather without the aid of 



doors of the adjacent rooms are glazed. Three gas tanks, 

 each with a volume of 50 cubic feet, supply gases to the com- 

 bustion-room directly above and to the lecture-room. 



The quantitative laboratory on the first floor has 48 desks 

 covered with porcelain tiles, like the other working tables on 



.'.SCAlt- 



BASEMENT. 



rsteam. The smaller boiler is for high-pressure steam, and it 

 lis connected into the pipe supplying steam to the laboratories. 

 In the preparation room, on this floor, the janitor pre- 

 pares solutions and other material in general use throughout 

 the laboratory. A large steam sink, a, with holes of sufficient 

 .size to admit a three-litre fiask, is extremely convenient for 



this floor. A steam hood has separate cups for evaporation, 

 and the space beneath is enclosed for drying closets; it has a 

 metallic lining with a large steam coil and wire shelves. In 

 the general hood are two copper plates, each 18" by 20", 

 above loQg burners for temperatures higher than 100°. The 

 smaller hood contains the air-baths. Hydric sulphide is de- 



PIKST STORY. 



making solutions. The tank, 6, supplies hydric sulphide 

 through lead pipes to the larger working-rooms. The space 

 under the entrance steps is enclosed in masonry and iron 

 doors for the storage of inflammable material. Distillations 

 are conducted on slate tables ia a room with the wood-work 

 covered with sheet-iron. For lighting the «ealral hall the 



livered from the lead pipe directly beneath a flue-opening. 

 All hoods are glazed throughout with sashes running between 

 a stationary inner and an outer sash, to protect the cord and 

 to extend the eflSciency of the hood to the lower level of the 

 running sash. To avoid obstructing the space with pillars, 

 the ceiling of this laboratory is supported on a heavy iron 



