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Case 1 . — An unusually large and complete display of the 
“Stassfurt Salts.” These salts are rich in potash and magnesia, 
and furnish nearly the who!e of the world’s supply of potash. 
Case 2. — Applications of potash salts. A collection of the 
compounds of potash as used in the arts. 
Case 3. — Soda salts. 
The most important mineral in this class is salt, many vari- 
eties of which are shown. Cryolite and its ores. The process of 
making soda and alumnia from cryolite is fully illustrated. 
Case 4. — Lime and Magnesia salts. These include gypsum, 
dolomite and magnesite. Applications of gypsum are included here 
as well as celesite and barite, compounds of strontia and baryta, 
alkaline earths allied to lime. 
Case 5. — Gypsum. This is a hydrated sulphate of lime from 
which plaster-of-paris and the fertilizer land-plaster are made. 
Case 6 .— Borates. The minerals from which borax is obtained 
and their products. 
Cases 7 and 8. — Phosphates. 
Mineral and rock phosphates from well-known localities in 
England, Spain, Canada, Carolina, Tennessee and Florida. 
Guano from Venezuela and Santiago de Cuba. 
Platform 14. — A large specimen of apatite from Canada. 
Case 9 . — Sulphur. Besides native sulphur from many local- 
ities, examples are given of the more important metalic compounds 
from which sulphur is obtained in commercial quantities. The 
various forms in which sulphur comes to the market are illus- 
trated . 
Case 10. — Asbestos, These specimens are of asbestos as mined 
and are not confined to the commercially valuable material but 
include also many specimens of grades which at present are of 
little economic importance. Consequently all stages between a 
nearly compact but somewhat columnar tremolite and the finely 
fibrous flexible asbestos of the best quality may be traced through 
these specimens. 
Case 11, — Mica. Besides the thin plates of mica of the best 
quality from leading American and Russian quarries, specimens of 
low grade material enable the visitor to note the difference be- 
tween the ordinary micas and the more valuable kinds. 
