2420 



Journal of Applied Microscopy 



The second stage of lighting halls, when the lighting is from both or all 

 sides, is the most adequate, and presents a less trying problem. As before, 

 the windows should be high, though not of necessity as high as in the first 

 instance, and they should be wide. In this case north and south halls have an 

 advantage over east and west halls. Considering a four-storied simple rectan- 

 gular structure as the form contemplated of the museum, the proportions of the 

 first section of the American Museum of Natural History in New York are 

 excellent. They can be always safely copied (Fig. 33) : 



Fa;. ;3o. — Section of North Wing, New York Museum. 



Whole length of building . . . . . 210 feet 



Tower at north end holding stairway - - - - 20 



Width of building ------- 64 



Height of building ------- 100 



Basement floor, above cellar, height . - - 22 



Main floor - ------- 25 



Gallery floor, surrounding main floor, width - - 15 



Gallery floor, surrounding main floor, height - - 15 



Fourth floor, height - - - - - - 22 



Fifth floor (work rooms), height - - - - 15 



