London. Royal Astronomical Society, 1898. [2], 546, plus 'Appendix' 61 pages. 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 Ex-libris Ministry of Defence with their stamp to the endpapers and occasionally throughout; ‘withdrawn’ stamp to front endpaper; corners a little worn; else a very good copy.