London. Royal Astronomical Society, 1901. [2], 646 pages., together with an Appendix [42 pages], 'List of Works presented to the Society, paged 67-102; another Appendix [30] pages. Illustrated with 18 full-page plates, some folding, 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 Ex-libris Ministry of Defence with their stamp to the title-page, ‘withdrawn’ stamp to front endpaper; corners a little worn; else a very good copy.