177 



TAB. CXCII. 



CARBO oxygenizatus. 

 Oxide of Carbon, or Coak. 



Class 1. Combustibles. Order 1. Homogeneous. 

 Gen. J. Carbon. Spec. 3. Oxide. 



I have been favoured by different friends with Coak, or 

 what is commonly termed Cinder, found near the Dyke of 

 Whinstone*, or Blue-stone Dyke, which crosses Cockfield 

 Fell, and other Coal-mines in the North. When the Coal in 

 these mines is examined, we find it is the more like Coak or 

 Cinder the nearer it is to the Whinstone. The figure will 

 show the Coak-like fracture on the Coal at the upper party 

 which is the appearance it had when I first received it, and 

 exactly corresponded with many more in the general nature 

 and appearance of artificial Coak, in forming a horizontal 

 columnar appearance, with cracks, and burning without 

 flame, 8tc. When examined wiih a lens, I found the per- 

 forations differing from artificial Coak, in being more 

 smooth and shining. The other part of the Coal was not 

 unlike common Coal at first appearance ; but on nicer exa- 

 mination with a lens, I perceived little globules of Pyrites, 

 fitting to, and filling the hollows, and giving an idea that 

 by their passing out the Coal would be rendered all like 

 the upper part. I put it into a drawer with the other spe- 



* Whin here must not be confounded with small-grained Granite : it is 

 rather a gray basalt including feldtspar. This dyke is of a very great extent. 



