Survival factor, by Charles V. De Vet 71592 [Author: Charles V. De Vet] [Link: https://www.gutenberg.org/7/1/5/9/71592] [Files: 71592-0.txt; 71592-h.htm] Thanks to Greg Weeks, Mary Meehan and the Online Distributed Proofreading Team at http://www.pgdp.net Regards, Al