Rough Ways Made Smooth, by Richard A. Proctor 54557 [Subtitle: A series of familiar essays on scientific subjects] [Link: http://www.gutenberg.org/5/4/5/5/54557 ] [Files: 54557-8.txt; 54557-h.htm] Thanks to Chris Curnow, Graeme Mackreth and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by The Internet Archive) Chuck