Association Affairs Science Exhibition + See all authors and affiliations Science 01 Mar 1946:Vol. 103, Issue 2670, pp. 273-279DOI: 10.1126/science.103.2670.273 Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears below.
Science Vol 103, Issue 267001 March 1946 Table of Contents Print Table of Contents Back Matter (PDF) Front Matter (PDF)
