News & Comment SCIENTIFIC NOTES AND NEWS See allHide authors and affiliations Science 02 Jan 1920:Vol. 51, Issue 1305, pp. 13-14DOI: 10.1126/science.51.1305.13 Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears below.
Science Vol 51, Issue 130502 January 1920 Table of Contents Print Table of Contents Back Matter (PDF) Front Matter (PDF)
