2382 



Journal of Applied Microscopy 



method of support or construction, are vexed questions. At the outset it is quite 

 evident that the height of ceilings should have a relation to the width of a hall, 

 as the wider the hall the more necessary to have high ceilings for the penetra- 



FiG. 28. — Chicago Academy of Sciences. 



tion of light across it from high windows. It is also clear that the ceilings of 

 all halls on one floor should have the same height. A good hard and fast rule 



Fig. '1\). — Delivery Hall, Public Library, Chicago. 



is, to make the height of a ceiling one-third the width of the hall. This will 

 generally admit of satisfactory illumination, if light is admitted from both sides, 

 and tolerable illumination, if admitted from only one. These are architectural 



