Letters Letter to the Editor By Patrick Butler Jr. See allHide authors and affiliations Science 16 Oct 1970:Vol. 170, Issue 3955, pp. 257DOI: 10.1126/science.170.3955.257-c Patrick Butler Jr.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.