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Journal of Applied Microscopy 



be fifty feet and may vary to thirty. Above fifty the illumination is reduced, 

 and below thirty the halls fail to furnish adequate space for economical exhibi- 

 tion. It is impossible to extend one building indefinitely north and south ; 

 additions in some way are imperative. Their best disposition, if the ground 

 is available, is in a succession of separated houses arranged so as not to interfere 

 with each other's light and connected by terminal halls. 



Groupings (Fig. 9) of this character can be indefinitely varied, and they can 

 be mide architecturally attractive separately, and their combination distinctly 

 imposing. But such groupings are usually impossible. They occupy too much 

 ground, they involve an expensive duplication in structure, and they are too 

 scattered, failing in massiveness and solidarity. They besides are more exhaust- 

 ive of effort and energy to visitors. Yet to such a degree as these long meri- 



n 



^ 



Fig. 10. 



dional structures can be obtained in connection with a more reasonable disposi- 

 tion of material they should be desired, because their illumination meets usually 

 the most exacting requirements. 



In cogency of design, as involving such an arrangement, a wide elongated 

 court, walled in by the continuous museum buildings with axes north and south, 

 can be recommended. The width of such a court, however, should scarcely be 

 less than five hundred feet, so that the opposite sides of the court should not 

 prove mutually obstructive of light in the mornings and afternoons. The north 

 and south walls connecting the ends of the long side structures will offer a great 

 deal of room, and cannot, of course, be rejected for exhibition uses, but in order 

 to secure light their ceilings should be high and their width greatly narrowed. 

 In this latitude such east and west buildings, if made deep, lose light greatly 

 along the north interior walls. A better plan, as involving less east and west 



