A. W. Wright—Gases in Smoky Quartz. 211 
the aid of a lens. The weight of the material employed was 
21°70 grams, which, divided by the specific gravity 2°63, gives 
for the volume 8-25 cubic centimeters. The second portion 
was of the darker variety, having a smoky brown color, appear- 
ing nearly black in large masses. The gas cavities in this were 
not so couspicuous, and apparently were less numerous. The 
amount of the material placed in the tube for examination was 
19°49 grams, and the volume 7:41 cubic centimeters. This 
oem is designated as No. 2 in the following paragraphs. 
he total quantity of gas collected from No. 1 was 13°61 cubic 
2 
centimeters, or 1°65 times the volume of the quartz. From 
f 
times the volume of the material employed. From the first 
portion examined in the preliminary work 1°33 volumes were 
obtained. 
. Th, : Mean. | 
CO, 98°34 CO, 98-32 98°33 
N 1°66 N 1°68 1°67 
100-00 100-00 100-00 
