News & Comment UNIVERSITY AND EDUCATIONAL NEWS Science 18 Jun 1909:Vol. 29, Issue 755, pp. 969-970DOI: 10.1126/science.29.755.969 Article Info & Metrics eLetters PDF Article Information vol. 29 no. 755 969-970 DOI: https://doi.org/10.1126/science.29.755.969 Published By: American Association for the Advancement of Science Print ISSN: 0036-8075 Online ISSN: 1095-9203 Copyright & Usage: © 1909 Other Contributors: American Association for the Advancement of Science Author Information Altmetric Article usage Article lifetimeLast 6 monthsThis monthArticle usage: April 2007 to September 2020 AbstractFullPdf Apr 2007001 Jul 2007001 Oct 2007001 Mar 2009001 Jul 2009001 Feb 2010001 Oct 2011001 Nov 2011002 Jan 2012001 Mar 2012001 Oct 2012001 Jul 2013001 Sep 2013100 Nov 2013200 Dec 20131100 Feb 2014100 Apr 2014100 Jul 2014200 Oct 2014100 Nov 2014100 Dec 2014100 Mar 2015001 Apr 2015100 Dec 2015200 Jan 2016200 Feb 2017001 Apr 2017002 Aug 2018001 Jul 2019001 Mar 2020001 Sep 2020001 View PDF Extract