LABORATORIES FOR GENERAL TEACHING & 



with sensitive instruments ; and two similar piers have been 

 placed in the apparatus room in the north-east comer. The 

 latter room is intended not only for the storage of apparatus, 

 but also for accurate measurements ; and it is proposed to keep 

 here, ready mounted but suitably protected from dust, various 

 frequently used assemblages of apparatus- such as that em- 

 ployed for the measurement of the conductivity of electrolytes. 



" The western half of the first floor contains a compact, flexible, 

 and highly convenient arrangement of laboratories in con- 

 nection with a balance room and dark room. Both balance 

 room and dark room may be used freely by men working either 

 on the southern or the northern side of the building, and the 

 balance room is protected on all sides by other rooms and a 

 passage with glass walls in such a way as to be as free as possible 

 from air currents or changes in temperature. The dark room 

 contains a hood and a solid pier on separate foundations, two 

 rather unusual accessories to such a place, but highly desirable 

 for accurate work in spectrometry. 



" On the second floor, at the top of the stairs leading from the 

 floor below, is the library, with an alcove for the librarian and 

 stenographer. This room is connected with the office and study 

 of the director, and also with an adjoining chemical preparation 

 room. The latter leads into a small analytical room for very 

 precise chemical work, and this connects with a physical labora- 

 tory and dark room to the east, arranged in connection with a 

 balance room and another laboratory to the north in the con- 

 venient manner adopted in the western end of the first floor. 

 Thus more or less space may be placed at the disposal of an 

 assistant. Flexibility in arrangement of this kind has been 

 sought throughout the building ; it is especially important in a 

 laboratory designed for a great variety of investigations, where 

 some students may need much space and others little. To 

 provide for yet wider flexibility, some of the partitions between 

 the smaller rooms are arranged in such a way that they could be 

 entirely removed without weakening the building if more large 

 rooms were ever needed. 



" The third floor contains a double repetition of the convenient 

 arrangement of the western half of the first floor, and in addition 

 a small common laboratory provided with a still and other general 

 apparatus needed by all the workers. 



" All the rooms are supplied with many pipes for various pur- 



