BITUMINOUS WOOD. s6g It is soft. It is sectile. It is rather elastic-flexible. It is rather easily frangible, It is so lieht as almost to swim on the surface of water. O Chemical Characters. It burns with a clear flame, and evolves, during com bustion, a peculiar bituminous smell, which is very diffe rent from that of black coal. Constituent Parts. According to Vauquelin, the bituminous wood of Rollo contains the following ingredients : Vegetable Earth, 54.0 Sulphate of Iron, 10.7 Sulphur, - 0.8 Oxide of Iron, 12.7 Sulphate of Lime, 0.7 Silica, - 0.2 Loss, - Geognoslic Situation. It usually occurs in alluvial land, in beds of common brown coal; sometimes also forming whole beds, part ot which is converted into common brown coal and earth coal. It sometimes also occurs in fragments, branches, &c. in clay; and in the Prussian amber-mines it is found *n considerable quantity, and occasionally with adhering amber. Hocks of the floetz-trap formation sometimes contain beds or imbedded portions of this mineral; and Vor,. IT, . A a it
