On Sulphonfluoresceïn and some of its Derivatives, by C. Willard Hayes 50531 [Link: http://www.gutenberg.org/5/0/5/3/50531 ] [Files: 50531-0.txt; 50531-h.htm] Thanks to Paul Marshall 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