Letters Cold and Warm Waves By H. A. Hazen See allHide authors and affiliations Science 27 Feb 1891:Vol. ns-17, Issue 421, pp. 121-122DOI: 10.1126/science.ns-17.421.121-b H. A. Hazen Find 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.