638 LIGNITE AND PEAT. 



D. Fibrous : brown coal, bituminized wood, 

 Bovey coal. The vegetable texture very apparent, 

 the colours brown or brownish black. 



Some of the surturbrand of Iceland belongs 

 to this variety. 



E. Earthy or pulverulent, sometimes a little 

 compact and retaining the texture of wood : contains 

 also remains of vegetables. 



Is found under a deep alluvial soil near 

 Cologne, and is known by the name of Cologne 

 earth in the arts. The thickness of the beds 

 reaches even to fifty feet. 



The lignite, or bituminous wood, found under 

 trap rocks, is of a more distant origin, and in 

 some cases appertains rather to the family of coal. 



F. Retaining more or less of the texture of wood 

 and passing into true coal. Basaltic wood ; and basal- 

 tic coal of some. 



