News & Comment SCIENTIFIC NOTES AND NEWS Science 24 Sep 1920:Vol. 52, Issue 1343, pp. 290DOI: 10.1126/science.52.1343.290 Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears above.
Science Vol 52, Issue 134324 September 1920 Table of Contents Print Table of Contents Back Matter (PDF)