London. Royal Astronomical Society, 1899. [2], 603, 62, plus 32 pages 'List of Works.' Illustrated with 9 full-page plates and with diagrams etc., within the text. Bound in half calf over marbled boards, recently rebacked. Octavo. Ex-libris Ministry of Defence with their stamp to the title-page and occasionally throughout; ‘withdrawn’ stamp to front endpaper; corners a little worn; else a very good copy.