News & Comment SCIENTIFIC NOTES AND NEWS See allHide authors and affiliations Science 24 Oct 1930:Vol. 72, Issue 1869, pp. 420-422DOI: 10.1126/science.72.1869.420 Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears below.
Science Vol 72, Issue 186924 October 1930 Table of Contents Print Table of Contents Front Matter (PDF)
