Letters Mars See allHide authors and affiliations Science 09 Sep 1892:Vol. ns-20, Issue 501, pp. 152DOI: 10.1126/science.ns-20.501.152 C. W. KemptonFind 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.