Letters Penetrating-power of arrows By L. O. Kellogg See allHide authors and affiliations Science 18 Jun 1886:Vol. ns-7, Issue 176, pp. 550DOI: 10.1126/science.ns-7.176.550-b L. O. KelloggFind 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.