ArticlesAddress THE INCREASING IMPORTANCE OF THE RARER ELEMENTS By Philip E. Browning See allHide authors and affiliations Science 23 Oct 1908:Vol. 28, Issue 721, pp. 548-555DOI: 10.1126/science.28.721.548 Philip E. BrowningFind this author on Google Scholar Find this author on PubMed Search for this author on this site Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears above.