Your PDF has successfully downloaded.

You may be interested in finding more content on these topics:

Access

You are not currently logged in.

Access JSTOR through your library or other institution:

login

Log in through your institution.

April 7

Proceedings of the Academy of Natural Sciences of Philadelphia
Vol. 26, No. 2 (Apr. - Sep., 1874), pp. 73-74
Stable URL: http://www.jstor.org/stable/4624396
Page Count: 2
Topics: Pebbles, Lava, Gravel, Mica
  • Download PDF
  • Add to My Lists
  • Cite this Item
We're having trouble loading this content. Download PDF instead.

Page Thumbnails