------------------+---------+---------+---------

_Second Experiment, Water Gas_.--The tube, A, was filled with small
pieces of anthracite, and heated until all the volatile matter had been
expelled. The tube, B, was then placed in tube, A, the joint being made
with fireclay, and to prevent the steam from carrying small particles of
solid carbon into ore in the upper tube, the anthracite was divided from
the ore by means of a piece of fine wire gauze. The steam at a pressure
of about 35 lb. to the square inch was passed through the anthracite.
The tube, A, was heated to white heat, the tube, B, at its lower end to
bright red, the top to cherry red.

------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
Experiment. | 1st. | 2d. | 3d. |
------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
Number. | I. | II. | III.| I. | II. | III.| IV. | I. | II. | III.|
------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
Total Iron. |60.59|60.92|60.54|65.24|61.71|61.93|57.23|59.73|57.93|55.54|
------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

Iron occurring as
------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
FeO. |12.60| 7.39| 1.17|46.98|18.59| 4.03| 0.84|29.45| 2.69| 1.12
Fe_{2}O_{3} |47.99|53.33|59.37|18.26|43.12|57.90|56.39|30.28|55.24|54.42
------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

Per cent. of Oxides. |
------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
FeO. |16.20| 9.50| 1.50|60.40|23.90| 5.18| 1.08|37.86| 3.46| 1.44
Fe_{2}O_{3}. |68.55|76.47|84.81|26.08|61.60|82.71|80.55|43.26|78.91|77.74
Total. |84.75|85.97|86.31|86.48|85.50|87.89|81.63|81.12|82.37|79.18
------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

Oxygen in Ore.
------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
Before experiment.|25.97|26.10|26.05|27.96|26.45|26.54|24.52|25.60|24.81|23.80
After experiment. |24.16|25.05|25.77|21.24|23.79|25.96|24.40|21.39|24.44|23.64
Difference. | 1.81| 1.05| 0.28| 6.72| 2.66| 0.58| 0.12| 4.21| 0.37| 0.16
------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

Per cent. of