The unseen universe, by Balfour Stewart 75232 [Subtitle: or, physical speculations on a future state] [Author: Balfour Stewart] [Author: Peter Guthrie Tait] [Link: https://www.gutenberg.org/ebooks/75232] note: link will be active within two hours of posting. Thanks to Tim Lindell, John Campbell and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive/American Libraries.) Regards, Robert