Appletons' Popular Science Monthly, April 1900, by Various 47183 [Subtitle: Vol. 56, Nov. 1899 to April, 1900] [Link: http://www.gutenberg.org/4/7/1/8/47183 ] [Files: 47183.txt; 47183-8.txt; 47183-0.txt; 47183-h.htm] Thanks to Greg Bergquist, Charlie Howard, and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by The Internet Archive) David