47 
HALLS 63 AND 64. 
SYSTEMATIC MINERALOGY. 
The systematic collection of minerals numbers about 5,000 
specimens. The arrangement of the collection is based upon that 
given in Dana’s New System of Mineralogy, and so far as possible 
the purpose has been to illustrate the different species there 
described. A copy of this work may be found in the library. 
The order which is to be followed in a study of the collection is 
shown by the numbering of the cases. Thus, entering Hall 63 
from the south, the visitor finds case No. i at his or her left, and 
the order then follows along the west wall through the oxides in 
Case 4, back on the western side of the center aisle, down the east- 
ern side, and back along the east wall; then passing to Hall 64, the 
the order continues with the phosphates in Case 15 on the western 
side and ends with Case 17 on the eastern side. 
The large headings above each case indicate the groups to 
which the specimens beneath belong, and in each division corres- 
ponding to these are tables showing the chemical composition and 
system of crystallization of these minerals. The individual speci- 
men labels show the name of the species and the locality.* 
Cases lA, 3A, 4, 6B, 8A, lOB, 15, 16.— As sped 
mens worthy of especial interest may be mentioned among the 
sulphides. Case lA. the large crystals of stibnite from Japan; 
among the haloids. Case 3A, the beautiful green and purple 
fluorites from English and American localities; among the oxides. 
Case 4, the extensive collection of natural and artificially colored 
agates' from South America; among the carbonates. Case 6B, 
the curiously distorted calcite crystals, sometimes called “but- 
terfly twins,” from Egremont, England, and the brilliant groups 
of the same mineral from the Big Rig Mine, Cumberland, 
England ; Case 7A, the Elos Eerri aragonites, which look like tri- 
umphs of the confectioners’ art, and the delicately tinged stalac- 
*Owing to the lighting of the hall from above, a good observation of the speci- 
mens is somewhat hindered by the reflection from the cases. In order to avoid 
this the observer is advised to view the specimens from the side rather than 
from the front. 
