The metadata below describe the original scanning. Follow the "All Files: HTTP" link in the "View the book" box to the left to find XML files that contain more metadata about the original images and the derived formats (OCR results, PDF etc.). See also the What is the directory structure for the texts? FAQ for information about file content and naming conventions.

"The letterpress of this memoir was published in an edition of fifty copies ... 1875. The principal edition will appear in the Journal of the Academy of Natural Sciences of Philadelphia, which has not yet been issued, in consequence of the delay in the completion of the plates. These are now published completing the separate memoir."--Note, in atlas

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