CADY AND MCFARLAND.| Composition of Natural Gas. 255 
nitrogen in the gas has been due to abstraction of oxygen of air 
by sulfids or whether the nitrogen has come from the depths. 
A somewhat similar occurrence of gases high in nitrogen in 
metalliferous mines is noted by Lindgren and Ransome. In 
several of the deeper mines of the Cripple Creek district gases 
issue from the breccia, frequently in such large volumes as to 
cause great inconvenience and at times force the abandonment 
of work for days atatime. The gas is often very heavy, filling 
lower parts of drifts and winzes like water, and cases are re- 
ported in which it has actually been bailed from a shaft. Its 
temperature is somewhat higher than that prevailing in the 
mine under normal conditions. It is tasteless and odorless, but 
produces suffocation and extinguishes flame. Analyses of 
samples collected have shown a small amount of oxygen, about 
twenty per cent. of carbon dioxid and the remainder nitrogen. 
These gases are believed by the authors of the above-men- 
tioned paper to be of volcanic origin. 
OTHER STATES. 
Natural gas. is produced in some quantity in several other 
states of the Union. Among these may be mentioned Texas, 
Wyoming, Montana, Missouri, South Dakota, Tennessee, Okla- 
homa, Louisiana. 
Very little analytical work has been published concerning 
the gases obtained in these states. In table 27, p. 270, we have 
shown the results which we have obtained from a few gases 
from Missouri, Oklahoma, South Dakota and Louisiana. We 
would be very much interested in seeing the composition of gas 
from other localities in the same states and in the states which 
are not represented in any of the above tables. 
CANADA. 
_ Natural gas is reported as a resource of considerable value 
in at least one Canadian province, Ontario. We have been un- 
able, however, to find any published analyses in the literature 
at our disposal. Two analyses of Canadian gas have been pub- 
lished by Francis C. Phillips. One® is a gas from a well at 
Point Albino, Canada, ten miles west of Buffalo. The other is 
155. Geol. Resurvey of the Cripple Creek District, Colorado. Bull. No. 254, U.S. 
Geol. Surv., p. 82. 
156. Jour. Am. Chem. Soe., 20, p. 700, 1898. 
