4. SUPPLEMENTAL COLLECTIONS. 

 1. ROUGH AND CUT STONES. 



It was Dr. Leander T. Chamberlain's expressed desire that the Lea 

 collection should consist, for the most part, of cut stones. For edu- 

 cational purposes, however, it seemed desirable to show in many 

 cases the rough materials as well, since there is often a marked 

 difference in appearance of the material in the two conditions. A 



Fig. 14.— Moss agates in rough and cut forms. 



supplemental collection has, therefore, been established, duplicating 

 the first in part. As at present installed this is limited to a single 

 case, comprising the minerals listed below, the rough material and the 

 stones cut from it being placed side by side, usually on the same 



block or pad. 



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