&2 in ELD MUSEUAI OF NATURAL HISTORY 
The last wall case contains types of iron ores. Each of the 
inineralogically different ores of iron appears here in many 
forms, giving rise to numerous sub-classes of iron ores. 
Opposite the wall cases of iron ores, two floor cases contain 
larger specimens of various ores, of which the magnetites and 
hematites of Sweden are especially noteworthy. 
The visitor should now proceed along the center of the hall 
and examine the large specimens showing the appearance of 
large masses of ore as actually met with in the mines. 
The first specimen is a mass of zinc ore (smithsonite) , 
weighing five tons, from IMarion county, Arkansas, showing 
botryoidal forms not unusual in ores which are, like this, of sec- 
ondary origin. 
Passing this, the tall case to the left contains bornite, a cop- 
per ore from Griqualand, South Africa. The iridescent tarnish 
which characterizes this ore is exceptionally well shown in this 
specimen. 
To the right stands another tall case containing a mass of red 
hematite from the Hart mines, Laramie county, Wyoming, 
one of the most largely used of western iron ores. 
Passing these two cases, a case standing in the center of the 
hall is next encountered. This contains a collection of the green 
and blue copper ores, malachite and azurite, from the Copper 
Queen mine of Bisbee, Arizona, a locality which has long been 
famed for the beauty of its ores. 
Beyond this are two cases, of which the one to the left con- 
tains a large block of lead-zinc ore from Laurium, Greece, while 
that to the right contains the green nickel and magnesium sili- 
cate, garnierite, which is a well-known nickel ore from New 
Caledonia. 
Passing these, the last specimen, directly opposite the en- 
trance to Hall 63, is a mass of nickel and copper ore weighing 
six tons, taken from 175 feet below ground in the third level of 
the Stobie mine, Sudbury, Ontario. 
Hall 78. 
SALTS OF THE ALKALIES AND ALKALINE 
EARTHS. 
These include besides salt and similar compounds such min- 
erals as asbestos and mica. Here belong also the borates, phos- 
