62 FIELD MUSEUM OF NATURAL HISTORY 
the principal zinc producing state. Included with these are the 
Kansas ores, which form a continuation of the same deposits. 
With the Missouri ores are shown ores from the similar de- 
posits Oi Wisconsin and western Illinois. These ores appear 
darker than those of Missouri, owing to the enclosure of bitum- 
inous matter. Another visible difference is in the frequent flat 
or tabular form of the Wisconsin ores and the presence of larger 
quantities of sulphides of iron. Large specimens of Missouri 
ores are in an adjacent floor case. 
Following the Missouri zinc ores come those of the south- 
eastern and south-central states. The Virginia and Tennesse 
ores are not essentially different from those of the ordinary type 
of zinc ores, while the deposits of southern Illinois, Kentucky, 
and New Jersey are decidedly unique. 
With the specimens from New Jersey there is a collection 
of those zinc-bearing minerals which occur in sufficient abund- 
ance to be of value as ores. 
The three cases across the entrance to Hall 63 from the zinc 
ores, contain ores of mercury and of various metals and metal- 
loids of lesser importanec. 
MERCURY. 
The first case to the right of the entrance contains a series 
of ores bearing mercury and cinnabar, with the rocks associated 
with them, from many localities. Mercury ores from Alaska, 
California, Russia, Mexico, and the United States of Colombia, 
are shown. 
The larger number of specimens represent the well-known 
Spanish mines. A large iron flask, sealed with a leaden seal, 
represents the package in which mercury is ordinarily sold. 
The following case contains ores of metals and metalloids of 
minor importance. These include ores of bismuth, molyb- 
denum, uranium, wolfram, chromium, and certain rare elements. 
ANTIMONY AND ARSENIC. 
The third case from the entrance of Hall 63 contains ores of 
antimony and arsenic. 
Specimens of stibnite, the common antimony ore, are shown 
from various localities in Japan, California, New South Wales, 
United States of Colombia, and Greece. Nearly all these speci- 
mens carry an appreciable percentage of gold. With the stib- 
