PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 161 
Vol. Vi, No. ff. Washington, D.C. Oct. 5, 1883, 
an accurate determination of their optical properties, but nevertheless 
are easily recognizable. The smaller crystals are often grouped together 
in clusters of half a dozen or more, but the larger are always single and 
scattering. The common form is that of a single prism not over 1™ long 
and perhaps one-half as broad. Geniculate forms, so characteristic of 
this mineral, are met with but rarely. 
On the bank of Rock Creek, near Oak Hill Cemetery, and in numerous 
other localities in the near vicinity, a tough, though not hard, dark- 
green rock is found interstratified with the prevailing schist, which has 
been supposed by some to be a trap-rock, or ‘‘ greenstone,” and presuma- 
bly it is this rock that is referred to in the quotation as griinstein.* 
But however much the rock may resemble a trap in its external 
appearance, it requires but a glance with the microscope to dispel the 
illusion. The rock consists of clear, glassy quartz, very rarely a small 
crystal of a triclinic feldspar, and an abundance of hornblende and mica, 
the former very extensively altered into chlorite; and itis in this respect 
only, so far as I have observed, that the rock differs from the prevailing 
schist in the neighborhood. So far as yet observed no true eruptive 
rock is to be found within the District limits. 
UNITED STATES NATIONAL MUSEUM, March 16, 1883. 
CATALOGUE OF A COLLECTION OF ETHNOLOGICAL SPECIMENS 
OBTAINED FROM THE UGASHAG™MUT TRIBE, UGASHAK RIVER, 
BRISTOL BAY, ALASKA, j 
By WILLIAM J. FISHER, 
United States Signal Service Observer at Kadiak.* 
UGASHAGMINT TRIBE, UGASHAK RIVER, BRISTOL BAY, ALASKA. 
1. Na-dshiak. Head-dress worn by women at dances and festivals. 
2. A-gach-wot. Ear-rings worn by women. 
“IT have found specimens of this rock in the Museum collection marked ‘Trap, or 
Greenstone,” though upon whose authority I do not know. 
*The form of the invoice is recommended to all collectors as containing much infor- 
mation of service in labeling and cataloguing a collection. It is desirable to add to 
the data furnished in this invoice the exact date when the various objects are col- 
lected, as this item will be of special value in the remote future in shedding light on 
the history and progress of the various tribes represented in the Ethnological collec- 
tions of the National Museum. 
Many of the articles in Mr. Fisher’s collection are restorations of archaic and obso- 
lete forms, and in reproducing them materials have been employed that are not 
strictly appropriate, as they have been introduced since the use of the articles has 
been discontinued. This is particularly the case with some of the bead-work, in 
making which beads of modern origin have been used.-—EDITOR. 
Proc. Nat. Mus. 83 ri 
