a Vein of Bituminous Coal in the Island of Cuba. 163 



tially disturbed, particularly near the outer edges, in which 

 case they were slightly curved. Where an accidental derange- 

 ment of the vein has taken place, this curving up of the outer 

 edges or extremities of the planes of stratified bituminous 

 matter is particularly observable. Near the walls of the vein* 

 the laminee of the coal for a few inches in depth are deflected, 

 as if they had been pressed by the sides or walls. Here the 

 structure becomes bacillary, and the coal on the slightest 

 effort divides into irregular polyhedrons. The surface of this 

 coal, when detached from the walls, instead of being smooth 

 or covered with any kind of bituminous shale, is rough, and 

 presents a bacillo-fibrous appearance, similar to the structure 

 observed in arragonites and other fibrous minerals. Two oc 

 three small branches oxjilons are seen passing from the main 

 vein at about the depth of twenty feet, occupying small fissures 

 in the surrounding rock. These branches all rise towards the 

 surface, but at different angles. 



Fig. 1. 



Section of the Coal Vein to the depth of 30 feet at the Mine of Casua- 

 Jiclad, in the Island of Cuba, 10 miles east of Havana. 



4 Feet. 



On the south side of the opening the coal, in rising towards 

 the outcrop, parts oflf'into two separate veins, longitudinally, 

 for an uncertain space ; and is apparently more disseminated 

 through this rock than on the north side. 



With regard, therefore, to the mine of Casualidad, we have 

 Y2 



