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THE JOURNAL OF GEOLOGY.

The subject discussed in this paper forms a part of thesis, on South Mountain, presented at the Johns Hopkins University. The petrographical study was conducted in the petrographical laboratory of that institution, under the immediate supervision of Professor G. H. Williams, to whose valuable suggestions and stimulating interest the writer is in every way indebted.

F. Bascom.

Petrographical Department, State University, Columbus, Ohio.
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