On the Existence of Active Oxygen, by Edward H. Keiser 52162 [Subtitle: Thesis Presented for the Attainment of the Degree of Doctor of Philosophy at the Johns Hopkins University] [Link: http://www.gutenberg.org/5/2/1/6/52162 ] [Files: 52162-0.txt; 52162-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