dcsimg
Please read BHL's Acknowledgment of Harmful Content

Internet Archive is currently down. As a result, page images are not displaying in BHL. 

For the latest updates, follow @internetarchive.

Sort By:
  1. By: Tucker, R. H. (Richard Hawley),
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 61
    Issue: 220
    Date: 1922
    Page Range: 123--135
    Publication Info: Philadelphia, American Philosophical Society,