Articles A Century of Progress in Smithsonian Biology See allHide authors and affiliations Science 09 Aug 1946:Vol. 104, Issue 2693, pp. 132-141DOI: 10.1126/science.104.2693.132 Remington KelloggFind 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.
Science Vol 104, Issue 269309 August 1946 Table of Contents Print Table of Contents Back Matter (PDF) Front Matter (PDF)