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cimens in October 1S04, and seldom looked at it till it 

 became conspicuous this year, when the Pyrites had de- 

 composed, and the Sulphur was passing out as figured, but 

 with a different effect to what it seemed to have had in its 

 native place ; for, instead of leaving the Coal in the form 

 of Coak, it was actually falling to pieces with another sort 

 of fracture and tendency to crumble to dust, as it seems 

 likely to do now very soon. The lower figure shows a frag- 

 ment partly columnar, with the empty holes ; the left hand 

 end shows the Pyrites in the upper holes and the Sulphur 

 below, corresponding with the figure of the little upper 

 particle of iron Pyrites, and the Sulphur dust underneath. 

 The Coal further from the Whin has fewer, but often larger, 

 holes in it, and it sometimes has only a few. At the 

 distance of a few feet the Coal is free from hollows, and 

 bums like the beet Newcastle Coal. 



