. The pictorial sketch-book of Pennsylvania, or, Its scenery, internal improvements, resources, and agriculture, populary described . FIG. 6.—STIGMARIA. originally succulent, marked externally with roundish tubercles, sur-rounded by a groove, and arranged in a direction more or less spiral—having a distinct axis, communicating with the tubercles by woodyprocesses. Fig. 7 exhibits a specimen of the Pterophyllum, or wing-leaf, of the family of Cycadccc, seldom met with in the coal, and ofwhich the leaves only are known. Fig. 8, however, of the samefamily, called Aster(ypliyllites, is one of the
. The pictorial sketch-book of Pennsylvania, or, Its scenery, internal improvements, resources, and agriculture, populary described . FIG. 6.—STIGMARIA. originally succulent, marked externally with roundish tubercles, sur-rounded by a groove, and arranged in a direction more or less spiral—having a distinct axis, communicating with the tubercles by woodyprocesses. Fig. 7 exhibits a specimen of the Pterophyllum, or wing-leaf, of the family of Cycadccc, seldom met with in the coal, and ofwhich the leaves only are known. Fig. 8, however, of the samefamily, called Aster(ypliyllites, is one of the most numerous dicotyle- ANTHRACITE COAL F 0 U M A T I 0 N . 127.
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Keywords: ., bookcentury1800, bookdecade, booksubjectminesandmineralresources
