CADY AND MCFARLAND.| Composition of Natural Gas. 
TABLE No. 48—CONCLUDED. 
LOCALITY. 
WESTPHALIA. 
X. “‘Zollverein’’ pit, near Essen, gas coal, 
XI. “Consolidation” pit, near Essen; gas 
XII. (a) “Sonnenschein”? seam, near 
Bochum; laminated with occasional iron 
TONKS 9 IDRSS AY GROG, 6 on cado0c0d0000c000000c 
(b) Do.; had been exposed during a year 
to the ventilation air-current of the pit........ 
XIII. (a) “Dickebank’’ seam; very like 
SUL @)e treaslalhy GROIN. oon co00c0d000000G000000 
(b) Do.; had been exposed for a year to 
WRTMENBOIN CUTAREUE 5 50000000500000000800G000000 
XIV. (a) “President’’ seam; not dis- 
tinetly schistose; freshly gotten .............. 
(6) Do.; exposed during a year to ventila- 
TELOIN, FRUGHOPNARS lbs SAMO AeA GOA Oe BHD CUA Bee anEs 
XV. (a) “Wilhelm’’ seam; not distinctly 
SON EONS & IRS AIK GROWEEIN, 6 600c00000000000000000 
(6) Do.; exposed for a year to ventilation 
GCUGLETIUG Hs crforainoretacrok inerecevalerolshee viel crayenind vans eanroune 
XVI. (a) “Franziska”? seam; distinctly 
schistose; rich in iron pyrites; freshly gotten, 
(6) Do.; exposed during a year to ventila- 
TONEC USOT Cir tec Ge hee Seo oon 
XVII. (a) “Leonhard’’ seam ; distinctly 
schistose and contains iron pyrites; freshly 
FSROUARSI AY icin BtbisIO CLG Gino GINA CO OIG IOC Oe eae entrar 
(6) Do.; exposed during a year to ventila- 
GIOTIMCUTENE MN Gaaner serena te ore eer Cees hens eae ES es 
Cubic 
em. of 
gas 
yielded 
301 
on 
41.2 
59.2 
- 42.0 
3.64 
3.72 
8.49 
2.12 
3.06 
$8) 
2.24 
1.60 
3.35 
0.90 
3.14 
0.39 
3.57 
87.94 
5.70 
trace 
All the specimens from XII to XVII, inclusive, were from “Constantine the Great’’ colliery, 
near Bochum, and are arranged in the order of their geological age, beginning with the oldest, 
No. XII. 
