Association Affairs SECTION G-BOTANY By Henry C. Cowles See allHide authors and affiliations Science 04 Jun 1909:Vol. 29, Issue 753, pp. 903-916DOI: 10.1126/science.29.753.903 Henry C. CowlesFind 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 above.