Products & Materials Equipment News + See all authors and affiliations Science 02 Dec 1955:Vol. 122, Issue 3179, pp. 1104DOI: 10.1126/science.122.3179.1104 Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears below.
Science Vol 122, Issue 317902 December 1955 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)
