THE EARTH’S CRUST. 
Some of the phenomena which are to be observed: (1) Sandstone rock in the Isle of Skye pierced by three intrusive veins of igneous material, all having their origin in one dyke. 
(2) Bristol coalfield showing coal-measures in a trough, bounded by ancient rocks on each side and overlain unconformably by New Red Strata. (3) This fault or crack in the coal- 
measures has resulted in the coal-seams being thrown down out of their normal position. They give much trouble to miners. (4) Granite veins in Micaceous Sandstone; in 5 the vein 
conforms to the layers of the Mica-schist, while in 6 the vein is contorted and cuts across the cleavage of the slates, which cleavage is brought about after the intrusion of the vein. 
