ROOMS. 



It consists of a main portion and a wing each two stories 

 in height. The main portion is a square of say fifty feet. 

 The walls are solid, there being no windows in the sides. 



DOOR- 



ARGH 



LECTURE ROOM. 



FIG. 21. 



The second floor consists of merely a gallery and thus the 

 whole of the main building is a single room, and lighted by 



a lantern window in the roof. The walls are occupied on 

 5 



