LettersDiscussion and Correspondence IONIZATION AND RADIATION By H. M. Dadourian See allHide authors and affiliations Science 19 Mar 1920:Vol. 51, Issue 1316, pp. 296DOI: 10.1126/science.51.1316.296 H. M. Dadourian Find 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.