Editorial Oaths and Disclaimers See allHide authors and affiliations Science 10 Jul 1959:Vol. 130, Issue 3367, pp. 69DOI: 10.1126/science.130.3367.69 G. DuS.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 below.