17. Blower in coal-mine. South Wales.

Notes:

1. Chiefly marsh-gas with ethane and some carbonic acid.
4. A mixture of marsh-gas, ethane and butane.
5. Chiefly propane, with small quantities of carbonic acid and
nitrogen.
10. Trace of heavy hydrocarbons.
11. Marsh-gas, with a little carbonic acid.
13. Chiefly marsh-gas, with small quantities of nitrogen and
15.86 per cent
carbonic acid.

References:

1. Fouque, "Comptes Rendus," lxvii, p. 1045.
2. H. Wurtz, "Am. Jour. Arts and Sci." (2), xlix, p. 336.
3. Robert Young.
4. Fouque, "Comptes Rendus," lxvii. p. 1045.
5. Fouque, "Comptes Rendus," lxvii. p. 1045.
6. S.P. Sadler, "Report L, 2d Geol. Sur. Pa.," p. 153.
7. S.P. Sadler, "Report L, 3d Geol. Sur. Pa.," p. 152.
8. S.P. Sadler, "Report L, 3d Geol. Sur. Pa.," p. 153.
9. S.P. Sadler, "Report L, 3d Geol. Sur. Pa.," p. 153.
10. F.C. Phillips.
11. Robert Young.
12. Rogers.
13. Fouque, "Comptes Rendus," lxvii, p. 1045.
14. Bischof's Chemical Geology," I, p. 730.