and Laboratory Methods. 



2223 



each other by corridors (Fig. 20), and even then not to allow a dimension less 

 than 50 feet square. The towers and angles of a museum frequently furnish 

 restricted areas where such individual displays can be made, but the practice is 

 pernicious. The lari^e hall should be steadily adhered to as the exhibition space of 

 science museum, and rooms, apartments, cells, galleries, corridor exhibits, and 

 small spaces resolutely frowned down. Large halls admit of rearrangement, 

 readjustment, replacement; they furnish the best opportunities for experiment ; 

 they accommodate the public better ; they are more easily cleaned and kept 

 clean ; they are almost invariably better lighted ; they are more healthy and 



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CENTRAL PAVILION 







Fig. -20. — Plan of Field Museum, Chicago. 



more cheerful ; they preserve a unity of design in the interior of the museum, 

 and they allow the greatest prolixity and variation of arrangement in the exhibits ; 

 cases of all sizes, and, if it is desired, all forms, can be accommodated in them, 

 and every problem of museum installation is more quickly and to greater satis- 

 faction solved in them than in restricted, cramped, irregular, or broken spaces. 

 Had such large halls been provided for the Free Public Museum in Liverpool 

 the recent report (1901) upon the unsatisfactory condition of the Lord Derby 

 collections would have been less despondent. L. P. Gratacap. 



American Museum of Natural History. 



Dissecting Needles. — A dissecting needle of suitable shape is often of 

 great convenience. If it is desired to bend it, it should be heated to a dull red 

 and allowed to cool gradually ; it can then be bent into any shape, and if desired 

 an edge can be ground or filed. To reharden, heat as before to blood-red heat 

 and plunge into cold water. In this condition it will be found too hard and 

 liable to break easily. It should be rubbed bright on fine emery paper, then 

 held in a spirit lamp until it assumes a pale straw color and again dipped into 

 cold water. The correct temper for use will then be obtained. — Knowledge, 26 : 

 209. 



