998 



SCIENCE. 



[N. S. Vol. Xrr. No. 313. 



throughout the building, the joists and ceil- 

 ings are finished with shellac and hard oil, 

 and the double floors, which are made of one 



the central portion of the building, as shown 

 in the floor plans, is a four-foot brick wall, 

 which carries the heating flues, and some 



In the Qualitative Laboratory. 



ventilating flues, where there is space avail- 

 able for them. 



The sj'stem of heating and ventilation, 

 which has been arranged with special care, 

 includes a fan blower driven by a Hi K. 

 W., direct current, electric motor; pri- 

 tered with ' cement plaster.' Ateachendof mary coils having 1,900 feet radiating sur- 



and one-fourth inch hard pine, are separated 

 by a half-inch air space and tarred paper. 

 The corridors are twelve feet wide, and the 

 walls, instead of being built of stone, are of 

 wood, with the spaces between the studs 

 ' nogged ' with brick. The building is plas- 



