41 
Cases lA, 3A, 4, 6B, 8A, lOB, 15, 16, — As specimens 
worthy of especial notice may be mentioned, among the sul- 
phides, Case I A, 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 magnificent 
groups of calcite from Joplin Missouri, the curiously distorted crys- 
tals, sometimes called “butterfly twins,” from Egremont, Eng- 
land, and the brilliant groups of the same mineral from the Big 
Rig Mine, Cumberland, England; Case 7 A, the Flos Ferri arago- 
nites, which look like triumphs of the confectioners’ art, and the 
delicately tinged stalactites of the same mineral from the Copper 
Queen Mine, Arizona; among the silicates. Case 8 A, the large 
crystals of Amazon stone from Pike’s Peak, Colorado, and. Case 
loB, the transparent and perfect crystals of topaz from Siberia; 
among the phosphates. Case 15, the richly colored vanadinites 
from Arizona, and among the sulphates, Case 16, the brilliant 
groups of barite from Cumberland, England, and of celestite from 
Sicily. 
Case 13, — A collection of natural and polished specimens of 
agatized wood from Arizona. 
Case 14. — ^A large display of the beautiful rubellite in lepido- 
lite from San Diego County, California, and some massive gypsum 
crystals from a cave in Wayne County, Utah. These crystals are 
of remarkable size, some being nearly four feet in length, and 
they are nearly transparent. 
Case 17A. — Collection of pseudomorphs, which illustrate the 
way in which one mineral may imitate or replace another. 
Cases 17B and C. — Series illustrating the physical proper- 
ties of minerals, such as form, structure, diaphaneity, lustre, 
hardness, and specific gravity. 
Cases 17D, E, and F, — A series of crystal models, repre- 
senting the typical forms and position of the axes in the six sys- 
tems of crystallization. Together with these are a number of 
models of crystals of the more common mineral species, and some 
of the crystals themselves. The models are mounted in their 
true crystallographic position, and are intended to illustrate not 
only the proper position, but also the distinctive crystal forms 
which characterize the common minerals. 
