160 TRANSACTIONS OF THE [APR. 8, 
ing” rocks,—such as quartz, feldspar, magnetic iron ore, flint, 
garnets, etc.,—mingled in clayey hills. 
He then gave a brief account of the collection of gems and 
gem-minerals of the United States, prepared for the coming Ex- 
position at Paris, as a part of the exhibit of Messrs. Tiffany & 
Co., of this city, and referred to by Prof. Martin at the last 
meeting of the Academy. 
The catalogue, now in preparation, will contain nearly four 
hundred entries, many of them including several specimens, 
under the general title of ‘‘ Precious and Ornamental Stones of 
North America.” 
First comes a series of native golds from California, Colorado, 
New Mexico, and North Carolina,-—crystallized, wire-gold, in 
quartz, etc.,—and native silvers from Lake Superior. Among 
the former is a portion of the first-discovered placer gold from 
Sutter’s Mill, California,—found by John Marshall, July 19th 
and 20th, 1849,—and a specimen of the gold in turquoise from 
Los Cerillos, N. M. 
Next is a group of gold and silver ornaments obtained from 
Indian mounds in Orange and Sumter Counties, Florida. 
North American diamonds are represented by four small crys- 
tals from California, and one from Kentucky (that just described 
from Cabin Fork Creek), and by models of others from North 
Carolina, Georgia, and Virginia, the latter being the largest (over 
twenty-three carats) found in this country, and known as the 
“‘ Dewey” diamond, 1855. 
A large set of corundum specimens, chiefly from North Caro- 
lina,—ruby, sapphire, green, brown, asteriated, etc.,—both cut 
and uncut, is shown. 
Very fine topazes are displayed, of rich wine-yellow, from 
Cheyenne Mountain, Colorado, and some white ones from other 
points. 
The North Carolina emeralds are naturally conspicuous, 
though more striking as crystals, for their size, color, and min- 
eralogical interest, than as transparent gems for jewelry. But 
the beryls from Maine and Connecticut, and from the snow-line 
locality on Mt. Antero, Colorado, have yielded cut specimens of 
