ArticlesAddress THE SIGNIFICANCE OF RADIUM See allHide authors and affiliations Science 01 Jul 1921:Vol. 54, Issue 1383, pp. 1-8DOI: 10.1126/science.54.1383.1 R. A. MillikanFind 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 below.