News & Comment News and Notes See allHide authors and affiliations Science 06 Nov 1953:Vol. 118, Issue 3071, pp. 541-547DOI: 10.1126/science.118.3071.541 Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears below.
Science Vol 118, Issue 307106 November 1953 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)