Letters Native Calendar of Central America and Mexico See allHide authors and affiliations Science 02 Feb 1894:Vol. ns-23, Issue 574, pp. 65DOI: 10.1126/science.ns-23.574.65 Cyrus ThomasFind 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.