News & Comment THE NATIONAL GEOGRAPHIC SOCIETY Science 01 Jan 1909:Vol. 29, Issue 731, pp. 21DOI: 10.1126/science.29.731.21 Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears above.
Science Vol 29, Issue 73101 January 1909 Table of Contents Print Table of Contents Front Matter (PDF)